\documentclass[12pt,a4paper,sloppy]{article}
<% @latex_config = { :recipe => [
	{:command => 'pdflatex'},
	{:command => 'bibtex', :arguments =>[]},
	{:command => 'pdflatex', :runs => 2}
]} # you can override the defaults if you wish; see LatexToPdf#config
%>
\usepackage{filecontents}
\usepackage{lastpage}
\usepackage{graphics}

\begin{filecontents}{bibliography.bib}
@article{example,
  author  = {John Doe},
  title   = {The title of the work},
  journal = {The name of the journal},
  year    = 1993,
  number  = 2,
  pages   = {201-213},
  month   = 7,
  note    = {An optional note},
  volume  = 4
}
\end{filecontents}

\begin{document}
This document\cite{example} uses \verb|parse_runs = 2| to calculate the last page.

Other defaults can be overridden using \verb|LatexToPdf#config| and \verb|@latex_config|.

<%= yield %>

\bibliography{bibliography}
\bibliographystyle{plain}


\end{document}