\documentclass[11pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[a4paper,margin=1cm,footskip=.5cm]{geometry}
\usepackage{isabelle,isabellesym}
\usepackage{tikz}

% Bibliography
\usepackage[authoryear,sort]{natbib}
\bibpunct();A{},

% Allow pdflatex to do some fancier spacing.
\usepackage{microtype}

% this should be the last package used
\usepackage{pdfsetup}

% urls in roman style, theory text in math-similar italics
\urlstyle{rm}
\isabellestyle{it}

% for uniform font size
\renewcommand{\isastyle}{\isastyleminor}
\renewcommand{\isacharunderscore}{\_}

\begin{document}

% sane default for proof documents
\parindent 0pt\parskip 0.5ex

\title{The Kuratowski Closure-Complement Theorem}
\author{Peter Gammie and Gianpaolo Gioiosa}
\maketitle

\tableofcontents

% sane default for proof documents
\parindent 0pt\parskip 0.5ex

% generated text of all theories
\input{session}

\bibliographystyle{plainnat}
\bibliography{root}
\addcontentsline{toc}{section}{References}

\end{document}

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