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\newblock In {\em Deductive and Object-oriented Databases}. Elsevier Science
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F.~Bancilhon, C.~Delobel, and P.~Kanellakis.
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\newblock Morgan Kaufmann Publishers, 1992.

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P.~Bunemann, J.~Hirschberg, and D.~Root.
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R.G.G. Cattell.
\newblock Next-generation database systems.
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\bibitem{ESQL90}
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\bibitem{Mano92}
F.~Manola, S.~Heiler, D.~Georgakopoulos, M.~Hornick, and M.~Brodie.
\newblock Distributed object management.
\newblock {\em International Journal of Intelligent and Cooperative Information
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\bibitem{MaJa89}
V.M. Matos and P.J. Jalics.
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\bibitem{Manifesto90}
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\newblock {\em ACM SIGMOD Record}, 19, September 1990.

\bibitem{ZdMa89}
S.B. Zdonik and D.~Maier.
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\newblock Morgan Kaufmann Publishers, 1989.

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