\begin{thebibliography}{1}

\bibitem{impacts}
Sarah~Longenbaker Bhuyan, Sanjeeb and Dmitry Portnyagin.
\newblock {\em Impacts on Glass - Final Report}.
\newblock 1989.

\bibitem{fracture}
K~Ravi-Chandar.
\newblock {\em Dynamic fracture of nominally brittle materials}.
\newblock International Journal of Fracture 90, 1998.

\end{thebibliography}
