\documentclass[12pt,twoside,a4paper]{book}
\usepackage[pdftex]{graphicx}
%\usepackage[pdftex]{hyperref}
\usepackage{epsfig}
\usepackage{a4}
\usepackage[margin=2cm]{geometry}
\pagestyle{headings}

\usepackage{afterpage}
\usepackage{latexsym}
\usepackage{ulem}
\usepackage{natbib}

% macros

\def \ba{\begin{array}}
\def \ea{\end{array}}

\def \be{\begin{equation}}
\def \ee{\end{equation}}

\def \bd{\begin{displaymath}}
\def \ed{\end{displaymath}}

\def \bfl{\begin{flushleft}}
\def \efl{\end{flushleft}}

\def \beqa{\begin{eqnarray}}
\def \eeqa{\end{eqnarray}}

\def \di{\displaystyle}

\def \degrees{^\circ}

\begin{document}

\begin{titlepage}
\begin{center}
\vspace*{3cm}
{\Huge\bf CAT} \\
\vspace*{0.5cm}
{\Huge\bf Computer Aided Turbulence} \\
\vspace*{1.5cm}
{\huge \bf User's Guide} \\
\vspace*{1cm}
{\huge \bf Version 0.0}
\vspace*{1cm}

{\large 
 Hartmut Borth\footnote{hartmut.borth@uni-hamburg.de} Edilbert Kirk 
                  \\
           Valerio Lucarini 
}

\end{center}
\end{titlepage}

\bibliographystyle{plainnat}

\tableofcontents

%===========================================================
\part{Model Physics}

 \input{chap_evoleq.tex}

%===========================================================
\part{Numerical Implementation}

 \input{chap_cathist.tex}

 \input{chap_pseudospec.tex}

 \input{chap_sims.tex}

%===========================================================
\part{Using CAT}

 \input{chap_impcat.tex}
 
 \input{chap_runcat.tex}

 \input{chap_catoutput.tex}

 \input{chap_modifycat.tex}

%===========================================================
\part{Appendix}

\begin{appendix}

 \input{app_namelists.tex}

 \input{app_modulsvariables.tex}
 
 \input{app_codestruct.tex}

\end{appendix}


\bibliography{ref}
\begin{appendix}
\end{appendix}

\end{document}