WIP: Update theoretical documentation

Author: stfnp

docs/theory-manual/document.bbl

@@ -10,12 +10,6 @@ K.J. Bathe.
 \newblock {\em Finite Element Procedures}.
 \newblock Prentice Hall, 2006.
 
-\bibitem{bib:bvmvn2007}
-Augusto Beléndez, Carolina Villalobos, David Méndez, Tarsicio Vázquez, and
-  Cristian Neipp.
-\newblock Exact solution for the nonlinear pendulum.
-\newblock {\em Revista Brasileira de Ensino de Física}, 29, 01 2007.
-
 \bibitem{bib:bergan1985}
 Pål~G. Bergan and Egil Mollestad.
 \newblock An automatic time-stepping algorithm for dynamic problems.
@@ -107,10 +101,9 @@ Diogo~Folador Rossi, Walnório~Graça Ferreira, Webe~João Mansur, and
   integration for structural dynamics analysis.
 \newblock {\em Engineering Structures}, 80:118--136, 2014.
 
-\bibitem{bib:catenary}
-Wikipedia.
-\newblock {Catenary} --- {W}ikipedia{,} the free encyclopedia.
-\newblock \url{https://en.wikipedia.org/wiki/Catenary}, 2022.
-\newblock [Online; accessed 04-October-2022].
+\bibitem{bib:zenkert1995}
+Dan Zenkert.
+\newblock {\em An Introduction to Sandwich Structures}.
+\newblock 1995.
 
 \end{thebibliography}

docs/theory-manual/document.blg

@@ -5,45 +5,46 @@ The style file: plain.bst
 Database file #1: references.bib
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 Warning--I didn't find a database entry for "fem_script_uni_bochum"
-You've used 20 entries,
+Warning--empty publisher in bib:zenkert1995
+You've used 19 entries,
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-> -- 258
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-(There were 2 warnings)
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+(There were 3 warnings)