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 \section{Quellen}
+
+\begin{thebibliography}{99}
+
+\bibitem{navarrofrenkwhite95}
+    Julio F. Navarro, Carlos S. Frenk and Simon D.M. White,
+    \textit{The Structure of Cold Dark Matter Halos},
+    1986.
+
+\bibitem{barneshut86}
+    Josh Barnes and Piet Hut,
+    \textit{A Hierarchical \(O ( N log N )\) Force calculation Algorithm},
+    Nature,
+    vol. 324, pp.446,
+    1986.
+
+
+\end{thebibliography}
+