\begin{thebibliography}{1}

\bibitem{Armstrong}
Armstrong {\it et al.}
\newblock {\em Phys. Rev.}, D{\bf 5}:1640, 1972.

\bibitem{Caldwell}
Caldwell {\it et al.}
\newblock {\em Phys. Rev.}, D{\bf 7}:1362, 1973.

\bibitem{durhamDB}
The Durham online database is located on the WWW at
  {http://durpdg.dur.ac.uk/HEPDATA}.

\bibitem{vavra}
J.~Va'Vra.
\newblock {\em Nuclear Inst. and Meth.}, {\bf A244}:391--415, 1986.

\bibitem{cussans}
D.G.Cussans.
\newblock {\em Nuclear Inst. and Meth.}, {\textbf{A244}}, pages={277},
  year=1995.

\end{thebibliography}
