\begin{thebibliography}{1}

\bibitem{ITS}
Donald Eastlake.
\newblock {ITS 1.5 Reference Manual}.
\newblock {\em {MIT AI Lab Memo}}, (161A), June 1968.

\bibitem{RFC977}
Brian Kantor and Phil Lapsley.
\newblock {Network News Transfer Protocol}.
\newblock February 1986.

\bibitem{KR2}
Brian Kernighan and Dennis Ritchie.
\newblock {\em {The C Programming Language, $2^{nd}$ edition}}.
\newblock Prentice Hall, 1988.

\end{thebibliography}
