Update references.bib

Author: Tom-van-Woudenberg

book/references.bib

@@ -54,3 +54,17 @@ @book{ruby
   year      = {2008},
   publisher = {O'Reilly Media}
 }
+
+@misc{sympy_why,
+  title={Sympy documentation},
+  author={{SymPy Development Team}},
+  howpublished={\url{https://docs.sympy.org/latest/tutorials/intro-tutorial/intro.html}},
+  year={2023}
+}
+
+@misc{jason_moore,
+  title={Learn Multibody Dynamics, SymPy},
+  author={Moore, Jason},
+  howpublished={\url{https://moorepants.github.io/learn-multibody-dynamics/sympy.html}},
+  year={2023}
+}