\begin{thebibliography}{1} \bibitem{Armstrong} Armstrong \emph{et al.} \newblock {\em Phys. Rev.}, D\textbf{5}:1640, 1972. \bibitem{Caldwell} Caldwell \emph{et al.} \newblock {\em Phys. Rev.}, D\textbf{7}:1362, 1973. \bibitem{durhamDB} The Durham online database is located on the WWW at {http://durpdg.dur.ac.uk/HEPDATA}. \bibitem{Genr8} P.~Eugenio. \newblock \emph{Genr8}: A general monte carlo event generator. \newblock Technical report, Carnegie Mellon University, 1998. \bibitem{hdgeant} R.~Jones, 2001. \newblock {The HDGeant Monte Carlo Program}. \bibitem{vavra} J.~Va'Vra. \newblock {\em Nuclear Inst. and Meth.}, A\textbf{244}:391--415, 1986. \bibitem{cussans} D.G.Cussans. \newblock {\em Nuclear Inst. and Meth.}, A\textbf{244}:277, 1995. \end{thebibliography}