\documentclass{article}

%a4
\oddsidemargin=-1.34cm
\textwidth=18.4cm
\topmargin=-1.04cm
\headsep=0cm
\headheight=0cm
\textheight=25cm

\begin{document}

\nocite{*}
\raggedright
\bibliographystyle{index.bst}
\twocolumn[\section*{Literature overview --- \today}]
\bibliography{examplerefs}

\end{document}
