\begin{thebibliography}{1}

\bibitem{monarc}
{\texttt{http://monarc.web.cern.ch/MONARC/}}.

\bibitem{ppdg}
{\texttt{http://www.ppdg.net/}}.

\bibitem{griphyn}
{\texttt{http://www.griphyn.org/}}.

\bibitem{ivdgl}
{\texttt{http://www.ivdgl.org/}}.

\bibitem{Thumb}
{Jim Gray and Prashant Shenoy}.
\newblock {Rules of Thumb in Data Engineering}.
\newblock In {\em {Proceedings of the 16th International Conference on Data
  Engineering}}, pages 3--12, 2000.
\newblock {Microsoft Research Technical Report MS-TR-99-100}.

\bibitem{ChipWeb}
{Chip Watson}.
\newblock {Web Services Data Grid Architecture}, March 2002.
\newblock {PPDG documentation}.

\bibitem{bird01}
{Ian Bird, \emph{et al.}}
\newblock {Common Storage Resource Manager Operations version 1.0}, October
  2001.
\newblock {PPDG documentation.
  http://www.ppdg.net/docs/documents\_and\_information.htm\#Reports}.

\end{thebibliography}