diff --git a/content/zettels/transconductance_amplifiers.md b/content/zettels/transconductance_amplifiers.md
index 633d01b..7e99d20 100644
--- a/content/zettels/transconductance_amplifiers.md
+++ b/content/zettels/transconductance_amplifiers.md
@@ -57,7 +57,7 @@ Such amplifier is used to control motors (e.g. voice coil, BLDC, stepper motors,
 
 ## Required properties {#required-properties}
 
-Main required properties are (taken from (<a href="#citeproc_bib_item_2">Schmidt, Schitter, and Rankers 2020</a>)):
+Main required properties are (taken from (<a href="#citeproc_bib_item_3">Schmidt, Schitter, and Rankers 2020</a>)):
 
 -   **Power delivery capability**
 -   **Dynamic properties**
@@ -212,7 +212,7 @@ W_stop = 0.0025 [W]
 
 ### Howland Current Sources {#howland-current-sources}
 
-See Section 4.2.5 in (<a href="#citeproc_bib_item_1">Horowitz 2015</a>).
+See Section 4.2.5 in (<a href="#citeproc_bib_item_2">Horowitz 2015</a>).
 
 Howland current source is shown in [Figure 1](#figure--fig:art-electronics-current-source).
 
@@ -230,6 +230,12 @@ Howland current source is shown in [Figure 1](#figure--fig:art-electronics-curre
 
 {{< figure src="/ox-hugo/okyay16_current_amplifier_schematic.png" caption="<span class='figure-number'>Figure 3: </span>From <&okyay16_mechat_desig_dynam_contr_metrol>, Appendix A" >}}
 
+There is a nice transconductance amplifier designed in (<a href="#citeproc_bib_item_1">Anthis 2021</a>) ([Figure 4](#figure--fig:anthis21-transconductance-schematic)).
+
+<a id="figure--fig:anthis21-transconductance-schematic"></a>
+
+{{< figure src="/ox-hugo/anthis21_transconductance_schematic.png" caption="<span class='figure-number'>Figure 4: </span>From <&anthis21_six_axis_levit_stage_novel>, Chapter 5" >}}
+
 
 ## Estimation of the required current noise {#estimation-of-the-required-current-noise}
 
@@ -287,6 +293,7 @@ In = 6.8e-06 [A/sqrt(Hz)]
 ## Bibliography {#bibliography}
 
 <style>.csl-entry{text-indent: -1.5em; margin-left: 1.5em;}</style><div class="csl-bib-body">
-  <div class="csl-entry"><a id="citeproc_bib_item_1"></a>Horowitz, Paul. 2015. <i>The Art of Electronics - Third Edition</i>. New York, NY, USA: Cambridge University Press.</div>
-  <div class="csl-entry"><a id="citeproc_bib_item_2"></a>Schmidt, R. M., G. Schitter, and A. Rankers. 2020. <i>The Design of High Performance Mechatronics - Third Revised Edition</i>. Ios Press.</div>
+  <div class="csl-entry"><a id="citeproc_bib_item_1"></a>Anthis, Austin Forrest. 2021. “Six-Axis Levitated Stage with a Novel Flux-Steering Magnetic Hub Actuator.” Massachusetts Institute of Technology.</div>
+  <div class="csl-entry"><a id="citeproc_bib_item_2"></a>Horowitz, Paul. 2015. <i>The Art of Electronics - Third Edition</i>. New York, NY, USA: Cambridge University Press.</div>
+  <div class="csl-entry"><a id="citeproc_bib_item_3"></a>Schmidt, R. M., G. Schitter, and A. Rankers. 2020. <i>The Design of High Performance Mechatronics - Third Revised Edition</i>. Ios Press.</div>
 </div>
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