1. A. Belussi, E. Bertino, and B. Catania. An extended algebra for constraint databases. IEEE TKDE, 10(5):686–705, 1998.
2. C. Bettini, X. S. Wang, and S. Jajodia. An architecture for supporting interoperability among temporal databases. In [6], pages 36–55. 1998.
3. Lect Notes Comput Sci,1999
4. J. Chomicki and P.Z. Revesz. Constraint-Based Interoperability of Spatiotemporal Database. Geoinformatica, 3(3):211–243, 1999.
5. Lect Notes Comput Sci;M. J. Egenhofer,1991