\begin{thebibliography}{1}
\newcommand{\enquote}[1]{``#1''}
\expandafter\ifx\csname url\endcsname\relax
  \def\url#1{\texttt{#1}}\fi
\expandafter\ifx\csname urlprefix\endcsname\relax\def\urlprefix{URL }\fi
\providecommand{\eprint}[2][]{\url{#2}}

\bibitem{Companion04}
F.~Mittelbach and M.~Goossens, \emph{The \LaTeX\ Companion}, 2nd ed.
  (Addison-Wesley, 2004).

\bibitem{Richter05}
C.~Richter and G.~H\"ausler, \enquote{Highly improved measurement speed of
  white light interferometry,} 106\superscript{\scriptsize th} conference of
  the DGaO, Wroc{\l}aw (Poland), p.~A4 (2005).
  \urlprefix\url{http://www.dgao-proceedings.de}.

\end{thebibliography}
