\documentclass[12pt,openany]{book}
\usepackage{url,color}
\makeatletter
\newfont{\scaledfont}{cmr12 scaled 7000}
\renewcommand\tableofcontents{%
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  \scaledfontTOC\contentsname\par\normalsize%
  \rule{\textwidth}{1pt}
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  \vskip 40\p@
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}
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\makeatother
\begin{document}

\tableofcontents

\chapter{Zero}
\section{One}
blah
\section{Two}
blah
\subsection{One}
blah
\subsubsection{Two}
blah
\nocite{*}

\bibliographystyle{plain}
\bibliography{/home/voss/texte/Literaturdatenbank}
\end{document}