\begin{thebibliography}{3}
\expandafter\ifx\csname natexlab\endcsname\relax\def\natexlab#1{#1}\fi
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\providecommand{\bibinfo}[2]{#2}
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\bibitem[{\citenamefont{Goodale et~al.}(2003)\citenamefont{Goodale, Allen,
  Lanfermann, Mass{\'o}, Radke, Seidel, and Shalf}}]{carpet-goodale2002a}
\bibinfo{author}{\bibfnamefont{T.}~\bibnamefont{Goodale}},
  \bibinfo{author}{\bibfnamefont{G.}~\bibnamefont{Allen}},
  \bibinfo{author}{\bibfnamefont{G.}~\bibnamefont{Lanfermann}},
  \bibinfo{author}{\bibfnamefont{J.}~\bibnamefont{Mass{\'o}}},
  \bibinfo{author}{\bibfnamefont{T.}~\bibnamefont{Radke}},
  \bibinfo{author}{\bibfnamefont{E.}~\bibnamefont{Seidel}}, \bibnamefont{and}
  \bibinfo{author}{\bibfnamefont{J.}~\bibnamefont{Shalf}},
  \emph{\bibinfo{title}{The {Cactus} framework and toolkit: Design and
  applications}}, in \emph{\bibinfo{booktitle}{Vector and Parallel Processing
  -- VECPAR'2002, 5th International Conference, Lecture Notes in Computer
  Science}} (\bibinfo{publisher}{Springer}, \bibinfo{address}{Berlin},
  \bibinfo{year}{2003}), \urlprefix\url{http://edoc.mpg.de/3341}.

\bibitem[{\citenamefont{Schnetter et~al.}(2006)\citenamefont{Schnetter, Diener,
  Dorband, and Tiglio}}]{carpet-schnetter2006a}
\bibinfo{author}{\bibfnamefont{E.}~\bibnamefont{Schnetter}},
  \bibinfo{author}{\bibfnamefont{P.}~\bibnamefont{Diener}},
  \bibinfo{author}{\bibfnamefont{E.~N.} \bibnamefont{Dorband}},
  \bibnamefont{and} \bibinfo{author}{\bibfnamefont{M.}~\bibnamefont{Tiglio}},
  \emph{\bibinfo{title}{A multi-block infrastructure for three-dimensional
  time-dependent numerical relativity}}, \bibinfo{journal}{Class. Quantum
  Grav.} \textbf{\bibinfo{volume}{23}}, \bibinfo{pages}{S553}
  (\bibinfo{year}{2006}), \eprint{arXiv:gr-qc/0602104},
  \urlprefix\url{http://arxiv.org/abs/gr-qc/0602104}.

\bibitem[{\citenamefont{Schnetter et~al.}(2004)\citenamefont{Schnetter, Hawley,
  and Hawke}}]{carpet-schnetter2003a}
\bibinfo{author}{\bibfnamefont{E.}~\bibnamefont{Schnetter}},
  \bibinfo{author}{\bibfnamefont{S.~H.} \bibnamefont{Hawley}},
  \bibnamefont{and} \bibinfo{author}{\bibfnamefont{I.}~\bibnamefont{Hawke}},
  \emph{\bibinfo{title}{Evolutions in 3d numerical relativity using fixed mesh
  refinement}}, \bibinfo{journal}{Class. Quantum Grav.}
  \textbf{\bibinfo{volume}{21}}, \bibinfo{pages}{1465} (\bibinfo{year}{2004}),
  \eprint{arXiv:gr-qc/0310042},
  \urlprefix\url{http://arxiv.org/abs/gr-qc/0310042}.

\end{thebibliography}