\begin{thebibliography}{1}

\bibitem{JGLR88}
W.~Johannsen, L.~Ge, W.~Lamersdorf, K.~Reinhard, and J.W. Schmidt.
\newblock Database application support in open systems: Language support and
  implementation.
\newblock In {\em Proceedings of the IEEE Fourth International Conference on
  Data Engineering, Los Angeles, California}, February 1988.

\bibitem{JLRS88}
W.~Johannsen, W.~Lamersdorf, K.~Reinhard, and J.W. Schmidt.
\newblock The {DURESS} project: Extending databases into an open systems
  architecture.
\newblock In {\em Proceedings of the First Conference on Extending Database
  Technology, EDBT'88}, volume 303 of {\em Lecture Notes in Computer Science},
  pages 616--620. Springer-Verlag, 1988.

\bibitem{MRSS92a}
F.~Matthes, A.~Rudloff, J.W. Schmidt, and K.~Subieta.
\newblock A gateway from {DBPL} to {Ingres}: {Modula-2}, {DBPL}, {SQL+C},
  {Ingres}.
\newblock FIDE Technical Report Series FIDE/92/54, FIDE Project Coordinator,
  Department of Computing Sciences, University of Glasgow, Glasgow G128QQ,
  August 1992.

\bibitem{ScMa93}
J.W. Schmidt and F.~Matthes.
\newblock Lean languages and models: Towards an interoperable kernel for
  persistent object systems.
\newblock In {\em Proceedings of the IEEE International Workshop on Research
  Issues in Data Engineering}, pages 2--16, April 1993.

\end{thebibliography}