\begin{thebibliography}{1}

\bibitem{ITKSoftwareGuide}
L.~Ibanez and W.~Schroeder.
\newblock {\em The {ITK} {S}oftware {G}uide}.
\newblock Kitware, Inc. ISBN 1-930934-10-6,
  http://www.itk.org/ItkSoftwareGuide.pdf, 2003.

\bibitem{VTKBook}
W.~Schroeder, K.~Martin, and B.~Lorensen.
\newblock {\em The Visualization Toolkit, An Object Oriented Approach to 3D
  Graphics}.
\newblock Kitware Inc, 1998.

\end{thebibliography}