\begin{thebibliography}{2}
\expandafter\ifx\csname natexlab\endcsname\relax\def\natexlab#1{#1}\fi
\expandafter\ifx\csname url\endcsname\relax
  \def\url#1{{\tt #1}}\fi

\bibitem[Gentleman and Gentry(2002)]{PubMedRnews}
R.~Gentleman and J.~Gentry.
\newblock Querying pubmed.
\newblock {\em R News}, 2\penalty0 (2):\penalty0 28--31, June 2002.
\newblock URL \url{http://CRAN.R-project.org/doc/Rnews/}.

\bibitem[{Temple Lang}(2000)]{XML}
Duncan {Temple Lang}.
\newblock Tools for parsing and generating xml within r and s-plus.
\newblock {\em CRAN}, 2000.
\newblock URL \url{http://www.omegahat.org/RSXML}.

\end{thebibliography}
