diff --git a/content/_sec_basic_ota.qmd b/content/_sec_basic_ota.qmd
index 09b6bb4..078066d 100644
--- a/content/_sec_basic_ota.qmd
+++ b/content/_sec_basic_ota.qmd
@@ -177,7 +177,8 @@ s_\mathrm{zd} = -\frac{2 \gm[34]}{\Cgs[34]}
 $$ {#eq-basic-ota-doublet-zero}
 
 ::: {.callout-note title="Why a Pole-Zero Doublet?"}
-Looking at @eq-basic-ota-doublet-pole and @eq-basic-ota-doublet-zero we see that this pair is intimately linked by the same parameters and can only move together. Hence we call it a "doublet."
+Looking at @eq-basic-ota-doublet-pole and @eq-basic-ota-doublet-zero we see that this pair is intimately linked by the same parameters and can only move together. Hence we call it a "doublet". The effects of pole-zero doublets on the frequency response and settling time of OTAs can be found in [@Kamath_1974]. This paper shows that doublets
+may cause severe degradation of settling time while only causing minor changes in the frequency response of the amplifier.
 :::
 
 ### OTA Noise
diff --git a/references.bib b/references.bib
index 10da4d5..d6265b9 100644
--- a/references.bib
+++ b/references.bib
@@ -6,6 +6,16 @@
 
 %% Saved with string encoding Unicode (UTF-8) 
 
+@article{Kamath_1974,
+  author={Kamath, B.Y.T. and Meyer, R.G. and Gray, P.R.},
+  doi={10.1109/JSSC.1974.1050527},
+  journal={IEEE Journal of Solid-State Circuits},
+  number={6},
+  pages={347-352},
+  title={Relationship between frequency response and settling time of operational amplifiers}, 
+  volume={9},
+  year={1974}}
+
 @online{Baker_compensating_OPAMP,
 author={R. J. Baker},
 title={Bad Circuit Design 3 - Compensating an Op-Amp},