clarified NEWS: document_files are officially required since Isabelle2014, but the absence was tolerated as legacy feature;
\documentclass[11pt,a4paper]{article}
\usepackage{isabelle,isabellesym}
% this should be the last package used
\usepackage{pdfsetup}
% urls in roman style, theory text in math-similar italics
\urlstyle{rm}
\isabellestyle{it}
\bibliographystyle{plain}
\begin{document}
\title{Ordinals and cardinals in HOL}
\author{Andrei Popescu \& Dmitriy Traytel}
\date{}
\maketitle
\tableofcontents
% sane default for proof documents
\parindent 0pt\parskip 0.5ex
\input{intro.tex}
\bibliography{root}
% generated text of all theories
\input{session}
% optional bibliography
%\bibliographystyle{abbrv}
%\bibliography{root}
\end{document}
%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
%%% End: