add reference

HelgeGehring · Nov 2, 2023 · 9901719 · 9901719
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diff --git a/docs/math/maxwell.md b/docs/math/maxwell.md
@@ -275,7 +275,7 @@ $$
 
 The mode profiles of bent waveguides can be calculated using the previously
 derived math with an transformed effective refractive index defined as
-{cite}`AzizurRahman2013`
+{cite}`AzizurRahman2013,shyroki2006exact`
 
 $$
     n_{eq}(x,y)

diff --git a/docs/references.bib b/docs/references.bib
@@ -253,3 +253,11 @@ @article{Lindecrantz2014
   pages         = {1836--1839},
   doi           = {10.1109/LPT.2014.2337055}
 }
+@misc{shyroki2006exact,
+  title         = {Exact equivalent-profile formulation for bent optical waveguides},
+  author        = {Dzmitry M. Shyroki},
+  year          = {2006},
+  eprint        = {physics/0605002},
+  archiveprefix = {arXiv},
+  primaryclass  = {physics.optics}
+}