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"On a Hierarchy of Classes for Nested Databases."
Marc Gyssens, Jan Paredaens, Dirk Van Gucht (1990)
- Marc Gyssens, Jan Paredaens, Dirk Van Gucht:
On a Hierarchy of Classes for Nested Databases. Inf. Process. Lett. 36(5): 259-266 (1990)
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