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diff --git a/buch/chapters/references.bib b/buch/chapters/references.bib
index 32a86ec..d14a3d2 100644
--- a/buch/chapters/references.bib
+++ b/buch/chapters/references.bib
@@ -118,3 +118,55 @@
 	YEAR = 2022,
 	url = {https://de.wikipedia.org/wiki/GNU_Multiple_Precision_Arithmetic_Library}
 }
+@article{buch:pearsondgl,
+	title = {Orthogonal matrix polynomials, scalar-type Rordigues' formulas and Pearson equations},
+	author = { Antonio J. Dur\'an and F. Alberto Grünbaum },
+	year = 2005,
+	journal = { Journal of Approximation theory },
+	volume = 134,
+	pages = {267-280}
+}
+
+@book{buch:specialfunctions,
+	author = { George E. Andrews and Richard Askey and Ranjan Roy },
+	title = { Special Functions },
+	series = { Encyclopedia of Mathematics and its applications },
+	volume = { 71 },
+	publisher = { Cambridge University Press },
+	ISBN = { 0-521-78988-5 },
+	year = 2004
+}
+
+@book{buch:ellfun-applications,
+	author = { Derek F. Lawden },
+	title = { Elliptic Functions and Applications },
+	series = { Applied Mathematical Sciences },
+	volume = { 80 },
+	publisher = { Springer-Verlag },
+	year = 2010,
+	ISBN = { 978-1-4419-3090-3 }
+}
+
+@article{buch:almkvist-berndt,
+	author = { Gert Almkvist und Bruce Berndt },
+	title = { Gauss, Landen, Ramanjujan, the Arithmetic-Geometric Mean, Ellipses $\pi$, and the {\em Ladies Diary} },
+	journal = { The American Mathematical Monthly },
+	volume = { 95 },
+	pages = { 585--608 },
+	year = 1988
+}
+
+@book{buch:schwalm,
+	author = { William A. Schwalm },
+	title = { Lectures on Selected Topics in Mathematical Physics: Elliptic Functions and Elliptic Integrals },
+	publisher = { IOP Science },
+	year = 2015,
+	ISBN = { 978-1-6817-4166-6 }
+}
+
+@misc{buch:schwalm-youtube,
+	author = { William A. Schwalm },
+	title = { Elliptic Functions and Elliptic Integrals },
+	howpublished = { \url{https://youtu.be/DCXItCajCyo} },
+	year = 2018
+}