\begin{thebibliography}{1}

\bibitem{OF77}
A.~Papoulis,
\newblock {\em Signal analysis},
\newblock McGraw-Hill, 1977.

\bibitem{OF94}
W.~E. Cleland and E.~G. Stern,
\newblock {\em Signal processing considerations for liquid ionization
  calorimeters in a high rate environment},
\newblock Nucl. Instrum. Meth. {\bf A338} (1994) 467.

\end{thebibliography}
