\begin{thebibliography}{STA91b}

\bibitem[RIG91]{RIG-Charter}
{Charter of the Reuse Library Interoperability Group}, May 1991.

\bibitem[STA91a]{CONOPS}
{STARS Reuse Concept of Operation}, August 1991.
\newblock {Version 0.5, Unisys CDRL Sequence No. 03725/001/00, Publication
  Number GR-7670-1251}.

\bibitem[STA91b]{STARS-Vision}
{STARS Vision}, May 1991.
\newblock {Version 0.1}.

\end{thebibliography}
