\begin{thebibliography}{99}

\bibitem{HVusingHOL}
A.~Camilleri, M.~Gordon, and T.~Melham.
\newblock Hardware verification using higher-order logic.
\newblock In D.~Borrione, editor, {\em Proceedings of the {IFIP} {WG} 10.2
  Working Conference: From {HDL} Descriptions to Guaranteed Correct Circuit
  Designs}, Grenoble, September 1986. North-Holland, Amsterdam (1987).
\newblock Also: University of Cambridge Computer Laboratory, Technical Report
  91, September 1986.

\bibitem{description} % OK
{\small DSTO} and {\small SRI} International,
{\it The HOL System: DESCRIPTION}, (1991).

\end{thebibliography}