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content/zettels/connectors.md
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## Manufacturers {#manufacturers}
| Manufacturers | Links |
|---------------|-------------------------------------------------|
| LEMO | [link](https://www.lemo.com/en) |
| Fischer | [link](https://www.fischerconnectors.com/uk/en) |
| Manufacturers | Links | Country |
|---------------|-------------------------------------------------|-------------|
| LEMO | [link](https://www.lemo.com/en) | Switzerland |
| Fischer | [link](https://www.fischerconnectors.com/uk/en) | Switzerland |
<./biblio/references.bib>

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content/zettels/force_sensors.md
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### Backlinks {#backlinks}
Backlinks:
- [Signal Conditioner]({{< relref "signal_conditioner" >}})
- [Sensors]({{< relref "sensors" >}})
- [Nanopositioning system with force feedback for high-performance tracking and vibration control]({{< relref "fleming10_nanop_system_with_force_feedb" >}})
- [Collocated Control]({{< relref "collocated_control" >}})
- [Position Sensors]({{< relref "position_sensors" >}})
- [Signal Conditioner]({{< relref "signal_conditioner" >}})
Tags
:
@@ -21,7 +21,7 @@ Tags
### Dynamics and Noise of a piezoelectric force sensor {#dynamics-and-noise-of-a-piezoelectric-force-sensor}
An analysis the dynamics and noise of a piezoelectric force sensor is done in ([Fleming 2010](#org82df6e1)) ([Notes]({{< relref "fleming10_nanop_system_with_force_feedb" >}})).
An analysis the dynamics and noise of a piezoelectric force sensor is done in ([Fleming 2010](#org25f6243)) ([Notes]({{< relref "fleming10_nanop_system_with_force_feedb" >}})).
### Manufacturers {#manufacturers}
@@ -36,17 +36,10 @@ An analysis the dynamics and noise of a piezoelectric force sensor is done in ([
### Signal Conditioner {#signal-conditioner}
The voltage generated by the piezoelectric material generally needs to be amplified.
The voltage generated by the piezoelectric material generally needs to be amplified using a [Signal Conditioner]({{< relref "signal_conditioner" >}}).
Either **charge** amplifiers or **voltage** amplifiers can be used.
| Manufacturers | Links | Country |
|---------------|------------------------------------------------------------------------------------|---------|
| PCB | [link](https://www.pcb.com/products?m=482c15) | USA |
| HBM | [link](https://www.hbm.com/en/2660/paceline-cma-charge-amplifier-analogamplifier/) | Germany |
| Kistler | [link](https://www.kistler.com/fr/produits/composants/conditionnement-de-signal/) | Swiss |
| MMF | [link](https://www.mmf.de/signal%5Fconditioners.htm) | Germany |
### Effect of using multiple Stacks in series of parallels {#effect-of-using-multiple-stacks-in-series-of-parallels}
@@ -60,4 +53,4 @@ However, if a charge conditioner is used, the signal will be doubled.
## Bibliography {#bibliography}
<a id="org82df6e1"></a>Fleming, A.J. 2010. “Nanopositioning System with Force Feedback for High-Performance Tracking and Vibration Control.” _IEEE/ASME Transactions on Mechatronics_ 15 (3):433–47. <https://doi.org/10.1109/tmech.2009.2028422>.
<a id="org25f6243"></a>Fleming, A.J. 2010. “Nanopositioning System with Force Feedback for High-Performance Tracking and Vibration Control.” _IEEE/ASME Transactions on Mechatronics_ 15 (3):433–47. <https://doi.org/10.1109/tmech.2009.2028422>.

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content/zettels/piezoelectric_actuators.md
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### Backlinks {#backlinks}
Backlinks:
- [Actuators]({{< relref "actuators" >}})
- [Voltage Amplifier]({{< relref "voltage_amplifier" >}})
@@ -35,7 +35,7 @@ Tags
### Model {#model}
A model of a multi-layer monolithic piezoelectric stack actuator is described in ([Fleming 2010](#orgdda2743)) ([Notes]({{< relref "fleming10_nanop_system_with_force_feedb" >}})).
A model of a multi-layer monolithic piezoelectric stack actuator is described in ([Fleming 2010](#orgf8860c8)) ([Notes]({{< relref "fleming10_nanop_system_with_force_feedb" >}})).
Basically, it can be represented by a spring \\(k\_a\\) with the force source \\(F\_a\\) in parallel.
@@ -50,27 +50,27 @@ with:
## Mechanically Amplified Piezoelectric actuators {#mechanically-amplified-piezoelectric-actuators}
The Amplified Piezo Actuators principle is presented in ([Claeyssen et al. 2007](#orga200a60)):
The Amplified Piezo Actuators principle is presented in ([Claeyssen et al. 2007](#org98162bd)):
> The displacement amplification effect is related in a first approximation to the ratio of the shell long axis length to the short axis height.
> The flatter is the actuator, the higher is the amplification.
A model of an amplified piezoelectric actuator is described in ([Lucinskis and Mangeot 2016](#org46de525)).
A model of an amplified piezoelectric actuator is described in ([Lucinskis and Mangeot 2016](#org47bb392)).
<a id="orgeed82ad"></a>
<a id="orgeb77af2"></a>
{{< figure src="/ox-hugo/ling16_topology_piezo_mechanism_types.png" caption="Figure 1: Topology of several types of compliant mechanisms <sup id=\"d9e8b33774f1e65d16bd79114db8ac64\"><a class=\"reference-link\" href=\"#ling16_enhan_mathem_model_displ_amplif\" title=\"Mingxiang Ling, Junyi Cao, Minghua Zeng, Jing Lin, \&amp; Daniel J Inman, Enhanced Mathematical Modeling of the Displacement Amplification Ratio for Piezoelectric Compliant Mechanisms, {Smart Materials and Structures}, v(7), 075022 (2016).\">(Mingxiang Ling {\it et al.}, 2016)</a></sup>" >}}
{{< figure src="/ox-hugo/ling16_topology_piezo_mechanism_types.png" caption="Figure 1: Topology of several types of compliant mechanisms <sup id=\"d9e8b33774f1e65d16bd79114db8ac64\"><a href=\"#ling16_enhan_mathem_model_displ_amplif\" title=\"Mingxiang Ling, Junyi Cao, Minghua Zeng, Jing Lin, \&amp; Daniel J Inman, Enhanced Mathematical Modeling of the Displacement Amplification Ratio for Piezoelectric Compliant Mechanisms, {Smart Materials and Structures}, v(7), 075022 (2016).\">ling16_enhan_mathem_model_displ_amplif</a></sup>" >}}
| **Manufacturers** | **Links** | **Country** |
|---------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------|
| Cedrat | [link](https://www.cedrat-technologies.com/en/products/actuators/amplified-piezo-actuators.html) | France |
| PiezoDrive | [link](https://www.piezodrive.com/actuators/ap-series-amplified-piezoelectric-actuators/) | Australia |
| Dynamic-Structures | [link](https://www.dynamic-structures.com/category/piezo-actuators-stages) | USA |
| Thorlabs | [link](https://www.thorlabs.com/newgrouppage9.cfm?objectgroup%5Fid=8700) | USA |
| Noliac | [link](http://www.noliac.com/products/actuators/amplified-actuators/) | Denmark |
| Mechano Transformer | [link](http://www.mechano-transformer.com/en/products/01a%5Factuator%5F5.html), [link](http://www.mechano-transformer.com/en/products/01a%5Factuator%5F3.html), [link](http://www.mechano-transformer.com/en/products/01a%5Factuator%5Fmtkk.html) | Japan |
| CoreMorrow | [link](http://www.coremorrow.com/en/pro-13-1.html) | China |
| PiezoData | [link](https://www.piezodata.com/piezoelectric-actuator-amplifier/) | China |
| Manufacturers | Links | Country |
|---------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------|
| Cedrat | [link](https://www.cedrat-technologies.com/en/products/actuators/amplified-piezo-actuators.html) | France |
| PiezoDrive | [link](https://www.piezodrive.com/actuators/ap-series-amplified-piezoelectric-actuators/) | Australia |
| Dynamic-Structures | [link](https://www.dynamic-structures.com/category/piezo-actuators-stages) | USA |
| Thorlabs | [link](https://www.thorlabs.com/newgrouppage9.cfm?objectgroup%5Fid=8700) | USA |
| Noliac | [link](http://www.noliac.com/products/actuators/amplified-actuators/) | Denmark |
| Mechano Transformer | [link](http://www.mechano-transformer.com/en/products/01a%5Factuator%5F5.html), [link](http://www.mechano-transformer.com/en/products/01a%5Factuator%5F3.html), [link](http://www.mechano-transformer.com/en/products/01a%5Factuator%5Fmtkk.html) | Japan |
| CoreMorrow | [link](http://www.coremorrow.com/en/pro-13-1.html) | China |
| PiezoData | [link](https://www.piezodata.com/piezoelectric-actuator-amplifier/) | China |
## Specifications {#specifications}
@@ -149,51 +149,51 @@ For a piezoelectric stack with a displacement of \\(100\,[\mu m]\\), the resolut
### Electrical Capacitance {#electrical-capacitance}
The electrical capacitance may limit the maximum voltage that can be used to drive the piezoelectric actuator as a function of frequency (Figure [2](#org9c97b26)).
The electrical capacitance may limit the maximum voltage that can be used to drive the piezoelectric actuator as a function of frequency (Figure [2](#org297ca75)).
This is due to the fact that voltage amplifier has a limitation on the deliverable current.
[Voltage Amplifier]({{< relref "voltage_amplifier" >}}) with high maximum output current should be used if either high bandwidth is wanted or piezoelectric stacks with high capacitance are to be used.
<a id="org9c97b26"></a>
<a id="org297ca75"></a>
{{< figure src="/ox-hugo/piezoelectric_capacitance_voltage_max.png" caption="Figure 2: Maximum sin-wave amplitude as a function of frequency for several piezoelectric capacitance" >}}
## Piezoelectric actuator experiencing a mass load {#piezoelectric-actuator-experiencing-a-mass-load}
When the piezoelectric actuator is supporting a payload, it will experience a static deflection due to its finite stiffness \\(\Delta l\_n = \frac{mg}{k\_p}\\), but its stroke will remain unchanged (Figure [3](#org6172e71)).
When the piezoelectric actuator is supporting a payload, it will experience a static deflection due to its finite stiffness \\(\Delta l\_n = \frac{mg}{k\_p}\\), but its stroke will remain unchanged (Figure [3](#org481d529)).
<a id="org6172e71"></a>
<a id="org481d529"></a>
{{< figure src="/ox-hugo/piezoelectric_mass_load.png" caption="Figure 3: Motion of a piezoelectric stack actuator under external constant force" >}}
## Piezoelectric actuator in contact with a spring load {#piezoelectric-actuator-in-contact-with-a-spring-load}
Then the piezoelectric actuator is in contact with a spring load \\(k\_e\\), its maximum stroke \\(\Delta L\\) is less than its free stroke \\(\Delta L\_f\\) (Figure [4](#org802b6e3)):
Then the piezoelectric actuator is in contact with a spring load \\(k\_e\\), its maximum stroke \\(\Delta L\\) is less than its free stroke \\(\Delta L\_f\\) (Figure [4](#orgf063765)):
\begin{equation}
\Delta L = \Delta L\_f \frac{k\_p}{k\_p + k\_e}
\end{equation}
<a id="org802b6e3"></a>
<a id="orgf063765"></a>
{{< figure src="/ox-hugo/piezoelectric_spring_load.png" caption="Figure 4: Motion of a piezoelectric stack actuator in contact with a stiff environment" >}}
For piezo actuators, force and displacement are inversely related (Figure [5](#orga68d9e2)).
For piezo actuators, force and displacement are inversely related (Figure [5](#org82b8a4e)).
Maximum, or blocked, force (\\(F\_b\\)) occurs when there is no displacement.
Likewise, at maximum displacement, or free stroke, (\\(\Delta L\_f\\)) no force is generated.
When an external load is applied, the stiffness of the load (\\(k\_e\\)) determines the displacement (\\(\Delta L\_A\\)) and force (\\(\Delta F\_A\\)) that can be produced.
<a id="orga68d9e2"></a>
<a id="org82b8a4e"></a>
{{< figure src="/ox-hugo/piezoelectric_force_displ_relation.png" caption="Figure 5: Relation between the maximum force and displacement" >}}
## Bibliography {#bibliography}
<a id="orga200a60"></a>Claeyssen, Frank, R. Le Letty, F. Barillot, and O. Sosnicki. 2007. “Amplified Piezoelectric Actuators: Static & Dynamic Applications.” _Ferroelectrics_ 351 (1):3–14. <https://doi.org/10.1080/00150190701351865>.
<a id="org98162bd"></a>Claeyssen, Frank, R. Le Letty, F. Barillot, and O. Sosnicki. 2007. “Amplified Piezoelectric Actuators: Static & Dynamic Applications.” _Ferroelectrics_ 351 (1):3–14. <https://doi.org/10.1080/00150190701351865>.
<a id="orgdda2743"></a>Fleming, A.J. 2010. “Nanopositioning System with Force Feedback for High-Performance Tracking and Vibration Control.” _IEEE/ASME Transactions on Mechatronics_ 15 (3):433–47. <https://doi.org/10.1109/tmech.2009.2028422>.
<a id="orgf8860c8"></a>Fleming, A.J. 2010. “Nanopositioning System with Force Feedback for High-Performance Tracking and Vibration Control.” _IEEE/ASME Transactions on Mechatronics_ 15 (3):433–47. <https://doi.org/10.1109/tmech.2009.2028422>.
<a id="org46de525"></a>Lucinskis, R., and C. Mangeot. 2016. “Dynamic Characterization of an Amplified Piezoelectric Actuator.”
<a id="org47bb392"></a>Lucinskis, R., and C. Mangeot. 2016. “Dynamic Characterization of an Amplified Piezoelectric Actuator.”

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## Reviews of Relative Position Sensors {#reviews-of-relative-position-sensors}
- Fleming, A. J., A review of nanometer resolution position sensors: operation and performance ([Fleming 2013](#org1ee8f98)) ([Notes]({{< relref "fleming13_review_nanom_resol_posit_sensor" >}}))
- Fleming, A. J., A review of nanometer resolution position sensors: operation and performance ([Fleming 2013](#org81e91f9)) ([Notes]({{< relref "fleming13_review_nanom_resol_posit_sensor" >}}))
<a id="table--tab:characteristics-relative-sensor"></a>
<div class="table-caption">
@@ -76,7 +76,7 @@ Description:
## Inductive Sensor (Eddy Current) {#inductive-sensor--eddy-current}
| Manufacturers | Links | |
| Manufacturers | Links | Country |
|----------------|-------------------------------------------------------------------------------------------|---------|
| Micro-Epsilon | [link](https://www.micro-epsilon.com/displacement-position-sensors/eddy-current-sensor/) | Germany |
| Lion Precision | [link](https://www.lionprecision.com/products/eddy-current-sensors) | USA |
@@ -117,9 +117,9 @@ Description:
| Renishaw | 0.2 | 1 | 6 | 1 |
| Picoscale | 0.2 | 2 | 2 | 1 |
([Jang and Kim 2017](#org3ee30b7))
([Jang and Kim 2017](#org64791e2))
<a id="org9edecbb"></a>
<a id="org75192f1"></a>
{{< figure src="/ox-hugo/position_sensor_interferometer_precision.png" caption="Figure 1: Expected precision of interferometer as a function of measured distance" >}}
@@ -136,6 +136,6 @@ Description:
## Bibliography {#bibliography}
<a id="org1ee8f98"></a>Fleming, Andrew J. 2013. “A Review of Nanometer Resolution Position Sensors: Operation and Performance.” _Sensors and Actuators a: Physical_ 190 (nil):106–26. <https://doi.org/10.1016/j.sna.2012.10.016>.
<a id="org81e91f9"></a>Fleming, Andrew J. 2013. “A Review of Nanometer Resolution Position Sensors: Operation and Performance.” _Sensors and Actuators a: Physical_ 190 (nil):106–26. <https://doi.org/10.1016/j.sna.2012.10.016>.
<a id="org3ee30b7"></a>Jang, Yoon-Soo, and Seung-Woo Kim. 2017. “Compensation of the Refractive Index of Air in Laser Interferometer for Distance Measurement: A Review.” _International Journal of Precision Engineering and Manufacturing_ 18 (12):1881–90. <https://doi.org/10.1007/s12541-017-0217-y>.
<a id="org64791e2"></a>Jang, Yoon-Soo, and Seung-Woo Kim. 2017. “Compensation of the Refractive Index of Air in Laser Interferometer for Distance Measurement: A Review.” _International Journal of Precision Engineering and Manufacturing_ 18 (12):1881–90. <https://doi.org/10.1007/s12541-017-0217-y>.

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### Backlinks {#backlinks}
Backlinks:
- [Modal Analysis]({{< relref "modal_analysis" >}})
@@ -14,8 +14,6 @@ Tags
## Manufacturers {#manufacturers}
<https://www.bksv.com/en/products/shakers-and-exciters/LDS-shaker-systems/permanent-magnet-shakers/V201>
| Manufacturers | Links | Country |
|--------------------|----------------------------------------------------------------------------------|-----------|
| Labsen | [link](http://labsentec.com.au/category/products/vibrationshock/) | Australia |

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content/zettels/signal_conditioner.md
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### Backlinks {#backlinks}
Backlinks:
- [Position Sensors]({{< relref "position_sensors" >}})
Tags
: [Force Sensors]({{< relref "force_sensors" >}})
: [Force Sensors]({{< relref "force_sensors" >}}), [Sensors]({{< relref "sensors" >}}), [Electronics]({{< relref "electronics" >}})
Most sensors needs some signal conditioner electronics before digitize the signal.
Few examples are:
@@ -29,22 +29,28 @@ The signal conditioning electronics can have different functions:
## Charge Amplifier {#charge-amplifier}
| Manufacturers | Links |
|---------------|---------------------------------------------------------------------------------------------------------------------|
| PCB | [link](https://www.pcb.com/sensors-for-test-measurement/electronics/line-powered-multi-channel-signal-conditioners) |
| Manufacturers | Links | Country |
|---------------|---------------------------------------------------------------------------------------------------------------------|---------|
| PCB | [link](https://www.pcb.com/sensors-for-test-measurement/electronics/line-powered-multi-channel-signal-conditioners) | USA |
| HBM | [link](https://www.hbm.com/en/2660/paceline-cma-charge-amplifier-analogamplifier/) | Germany |
| Kistler | [link](https://www.kistler.com/fr/produits/composants/conditionnement-de-signal/) | Swiss |
| MMF | [link](https://www.mmf.de/signal%5Fconditioners.htm) | Germany |
## Voltage Amplifier {#voltage-amplifier}
| Manufacturers | Links |
|---------------|------------------------------------------------------------------|
| Femto | [link](https://www.femto.de/en/products/voltage-amplifiers.html) |
| Manufacturers | Links | Country |
|---------------|------------------------------------------------------------------------------------|---------|
| Femto | [link](https://www.femto.de/en/products/voltage-amplifiers.html) | Germany |
| HBM | [link](https://www.hbm.com/en/2660/paceline-cma-charge-amplifier-analogamplifier/) | Germany |
| Kistler | [link](https://www.kistler.com/fr/produits/composants/conditionnement-de-signal/) | Swiss |
| MMF | [link](https://www.mmf.de/signal%5Fconditioners.htm) | Germany |
## Current Amplifier {#current-amplifier}
| Manufacturers | Links |
|---------------|------------------------------------------------------------------|
| Femto | [link](https://www.femto.de/en/products/current-amplifiers.html) |
| Manufacturers | Links | Country |
|---------------|------------------------------------------------------------------|---------|
| Femto | [link](https://www.femto.de/en/products/current-amplifiers.html) | Germany |
<./biblio/references.bib>

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Backlinks:
- [Rotation Stage]({{< relref "rotation_stage" >}})
Tags
:
| Manufacturers | Links |
|---------------|---------------------------------|
| Moflon | [link](https://www.moflon.com/) |
## Manufacturers {#manufacturers}
| Manufacturers | Links | Country |
|---------------|---------------------------------|---------|
| Moflon | [link](https://www.moflon.com/) | China |
<./biblio/references.bib>

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## Vibration Isolating Pads {#vibration-isolating-pads}
| Manufacturer | links |
|--------------|----------------------------------|
| ACE | [link](https://www.ace-ace.com/) |
| Manufacturer | links | Country |
|--------------|----------------------------------|---------|
| ACE | [link](https://www.ace-ace.com/) | Germany |
## Vibration Isolation Tables {#vibration-isolation-tables}
| Manufacturer | links |
|-------------------|----------------------------------------------------------------------------------|
| TMC | [link](https://www.techmfg.com/products/stacis/stacisiii) |
| Newport | [link](https://www.newport.com/f/guardian-active-isolation-workstations) |
| Thorlabs | [link](https://www.thorlabs.com/navigation.cfm?guide%5FID=42) |
| IDE | [link](https://www.ideworld.com/en/active%5Fvibration%5Fisolation.html) |
| Harvard Apparatus | [link](https://www.warneronline.com/labmate-vibraplane-workstations-9100-series) |
| Herzan | [link](https://www.herzan.com/products/active-vibration-control/avi-series.html) |
| Standa | [link](http://www.standa.lt/products/catalog/optical%5Ftables?item=335) |
| Table Stable | [link](http://www.tablestable.com/en/products/list/2/) |
| Accurion | [link](https://www.halcyonics.com/active-vibration-isolation-products) |
| Vibiso | [link](https://vibiso.com/?page%5Fid=3433) |
| Manufacturer | links | Country |
|-------------------|----------------------------------------------------------------------------------|-------------|
| TMC | [link](https://www.techmfg.com/products/stacis/stacisiii) | USA |
| Newport | [link](https://www.newport.com/f/guardian-active-isolation-workstations) | USA |
| Thorlabs | [link](https://www.thorlabs.com/navigation.cfm?guide%5FID=42) | USA |
| IDE | [link](https://www.ideworld.com/en/active%5Fvibration%5Fisolation.html) | Germany |
| Harvard Apparatus | [link](https://www.warneronline.com/labmate-vibraplane-workstations-9100-series) | USA |
| Herzan | [link](https://www.herzan.com/products/active-vibration-control/avi-series.html) | USA |
| Standa | [link](http://www.standa.lt/products/catalog/optical%5Ftables?item=335) | Lithuania |
| Table Stable | [link](http://www.tablestable.com/en/products/list/2/) | Switzerland |
| Accurion | [link](https://www.halcyonics.com/active-vibration-isolation-products) | Germany |
| Vibiso | [link](https://vibiso.com/?page%5Fid=3433) | USA |
<./biblio/references.bib>

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content/zettels/voice_coil_actuators.md
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### Backlinks {#backlinks}
Backlinks:
- [Actuators]({{< relref "actuators" >}})
- [Shaker]({{< relref "shaker" >}})
- [Current Amplifier]({{< relref "current_amplifier" >}})
Tags
: [Actuators]({{< relref "actuators" >}})
@@ -15,20 +16,23 @@ Tags
## Manufacturers {#manufacturers}
| Manufacturers | Links |
|----------------------|----------------------------------------------|
| Geeplus | [link](https://www.geeplus.com/) |
| Maccon | [link](https://www.maccon.de/en.html) |
| TDS PP | [link](https://www.tds-pp.com/en/) |
| H2tech | [link](https://www.h2wtech.com/) |
| PBA Systems | [link](http://www.pbasystems.com.sg/) |
| Celera Motion | [link](https://www.celeramotion.com/) |
| Beikimco | [link](http://www.beikimco.com/) |
| Electromate | [link](https://www.electromate.com/) |
| Magnetic Innovations | [link](https://www.magneticinnovations.com/) |
| Monticont | [link](http://www.moticont.com/) |
| Manufacturers | Links | Country |
|----------------------|----------------------------------------------|-------------|
| Geeplus | [link](https://www.geeplus.com/) | UK |
| Maccon | [link](https://www.maccon.de/en.html) | Germany |
| TDS PP | [link](https://www.tds-pp.com/en/) | Switzerland |
| H2tech | [link](https://www.h2wtech.com/) | USA |
| PBA Systems | [link](http://www.pbasystems.com.sg/) | Singapore |
| Celera Motion | [link](https://www.celeramotion.com/) | USA |
| Beikimco | [link](http://www.beikimco.com/) | USA |
| Electromate | [link](https://www.electromate.com/) | Canada |
| Magnetic Innovations | [link](https://www.magneticinnovations.com/) | Netherlands |
| Monticont | [link](http://www.moticont.com/) | USA |
## Typical Specifications {#typical-specifications}
## Model of a Voice Coil Actuator {#model-of-a-voice-coil-actuator}
<./biblio/references.bib>