diff --git a/content/zettels/actuators.md b/content/zettels/actuators.md
index 06e2e9f..3b63416 100644
--- a/content/zettels/actuators.md
+++ b/content/zettels/actuators.md
@@ -17,35 +17,26 @@ Links to specific actuators:
 
 For vibration isolation:
 
--   In <sup id="aad53368e29e8a519e2f63857044fa46"><a class="reference-link" href="#ito16_compar_class_high_precis_actuat" title="Shingo Ito \&amp; Georg Schitter, Comparison and Classification of High-Precision Actuators  Based on Stiffness Influencing Vibration Isolation, {IEEE/ASME Transactions on Mechatronics}, v(2), 1169-1178 (2016).">(Shingo Ito \& Georg Schitter, 2016)</a></sup>, the effect of the actuator stiffness on the attainable vibration isolation is studied ([Notes]({{< relref "ito16_compar_class_high_precis_actuat" >}}))
-
-
-## Shaker {#shaker}
-
-| Manufacturers      | Links                                                         |
-|--------------------|---------------------------------------------------------------|
-| BKSV               | [link](https://www.bksv.com/en/products/shakers-and-exciters) |
-| Vibration Research | [link](https://vibrationresearch.com/shakers/)                |
-| Sentek Dynamics    | [link](https://www.sentekdynamics.com/)                       |
-
-<https://www.bksv.com/en/products/shakers-and-exciters/LDS-shaker-systems/permanent-magnet-shakers/V201>
+-   In ([Ito and Schitter 2016](#org9138007)), the effect of the actuator stiffness on the attainable vibration isolation is studied ([Notes]({{< relref "ito16_compar_class_high_precis_actuat" >}}))
 
 
 ## Brush-less DC Motor {#brush-less-dc-motor}
 
--   <sup id="d2e68d39d09d7e8e71ff08a6ebd45400"><a class="reference-link" href="#yedamale03_brush_dc_bldc_motor_fundam" title="Yedamale, Brushless Dc (BLDC) Motor Fundamentals, {Microchip Technology Inc}, v(), 3--15 (2003).">(Yedamale, 2003)</a></sup>
+-   ([Yedamale 2003](#org6977e93))
 
 <https://www.electricaltechnology.org/2016/05/bldc-brushless-dc-motor-construction-working-principle.html>
 
-# Bibliography
-<a class="bibtex-entry" id="ito16_compar_class_high_precis_actuat">Ito, S., & Schitter, G., *Comparison and classification of high-precision actuators based on stiffness influencing vibration isolation*, IEEE/ASME Transactions on Mechatronics, *21(2)*, 1169–1178 (2016).  http://dx.doi.org/10.1109/tmech.2015.2478658</a> [↩](#aad53368e29e8a519e2f63857044fa46)
 
-<a class="bibtex-entry" id="yedamale03_brush_dc_bldc_motor_fundam">Yedamale, P., *Brushless dc (bldc) motor fundamentals*, Microchip Technology Inc, *20()*, 3–15 (2003). </a> [↩](#d2e68d39d09d7e8e71ff08a6ebd45400)
+## Bibliography {#bibliography}
+
+<a id="org9138007"></a>Ito, Shingo, and Georg Schitter. 2016. “Comparison and Classification of High-Precision Actuators Based on Stiffness Influencing Vibration Isolation.” _IEEE/ASME Transactions on Mechatronics_ 21 (2):1169–78. <https://doi.org/10.1109/tmech.2015.2478658>.
+
+<a id="org6977e93"></a>Yedamale, Padmaraja. 2003. “Brushless Dc (BLDC) Motor Fundamentals.” _Microchip Technology Inc_ 20:3–15.
 
 
 ## Backlinks {#backlinks}
 
--   [Comparison and classification of high-precision actuators based on stiffness influencing vibration isolation]({{< relref "ito16_compar_class_high_precis_actuat" >}})
--   [Collocated Control]({{< relref "collocated_control" >}})
 -   [Voice Coil Actuators]({{< relref "voice_coil_actuators" >}})
+-   [Collocated Control]({{< relref "collocated_control" >}})
+-   [Comparison and classification of high-precision actuators based on stiffness influencing vibration isolation]({{< relref "ito16_compar_class_high_precis_actuat" >}})
 -   [Piezoelectric Actuators]({{< relref "piezoelectric_actuators" >}})
diff --git a/content/zettels/shaker.md b/content/zettels/shaker.md
index 3ca6838..ea98cba 100644
--- a/content/zettels/shaker.md
+++ b/content/zettels/shaker.md
@@ -10,12 +10,17 @@ Tags
 
 ## Manufacturers {#manufacturers}
 
-| Manufacturers   | Links                                                                            |
-|-----------------|----------------------------------------------------------------------------------|
-| Labsen          | [link](http://labsentec.com.au/category/products/vibrationshock/)                |
-| The Modal Shop  | [link](http://www.modalshop.com/excitation/Electrodynamic-Exciter-Family?ID=243) |
-| Deweshop        | [link](https://dewesoft.com/fr/products/interfaces-and-sensors/shakers)          |
-| Bruel and Kjaer | [link](https://www.bksv.com/en/products/shakers-and-exciters/LDS-shaker-systems) |
-| YMC             | [link](http://www.chinaymc.com/product/showproduct.php?id=78&lang=en)            |
+<https://www.bksv.com/en/products/shakers-and-exciters/LDS-shaker-systems/permanent-magnet-shakers/V201>
+
+| Manufacturers      | Links                                                                            |
+|--------------------|----------------------------------------------------------------------------------|
+| Labsen             | [link](http://labsentec.com.au/category/products/vibrationshock/)                |
+| The Modal Shop     | [link](http://www.modalshop.com/excitation/Electrodynamic-Exciter-Family?ID=243) |
+| Deweshop           | [link](https://dewesoft.com/fr/products/interfaces-and-sensors/shakers)          |
+| Bruel and Kjaer    | [link](https://www.bksv.com/en/products/shakers-and-exciters/LDS-shaker-systems) |
+| YMC                | [link](http://www.chinaymc.com/product/showproduct.php?id=78&lang=en)            |
+| BKSV               | [link](https://www.bksv.com/en/products/shakers-and-exciters)                    |
+| Vibration Research | [link](https://vibrationresearch.com/shakers/)                                   |
+| Sentek Dynamics    | [link](https://www.sentekdynamics.com/)                                          |
 
 <./biblio/references.bib>