\documentclass[11pt,a4paper]{article}
\usepackage{isabelle,isabellesym}
\usepackage{latexsym}
% this should be the last package used
\usepackage{pdfsetup}
\usepackage{isaverbatimwrite}
% urls in roman style, theory text in math-similar italics
\urlstyle{rm}
\isabellestyle{it}
% for uniform font size
\renewcommand{\isastyle}{\isastyleminor}
\begin{document}
\openisaverbatimout fragments
\title{Concrete Semantics}
\author{TN \& GK}
\maketitle
\setcounter{tocdepth}{2}
\tableofcontents
\newpage
% generated text of all theories
\input{session}
\nocite{Nipkow}
% optional bibliography
\bibliographystyle{abbrv}
\bibliography{root}
\end{document}