On the operations over relations in the relational model data with two types of null values.
Publications de l 'Institut Mathématique. Nouvelle Série, 34(48) (1983), p. 151.

Voir la notice de l'article dans European Digital Mathematics Library

Classification : 68P05
Mots-clés : Three-valued logic, null values, Relational algebra, query optimization 
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     title = {On the operations over relations in the relational model data with two types of null values.},
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Pavlović, Gordana M. On the operations over relations in the relational model data with two types of null values.. Publications de l 'Institut Mathématique. Nouvelle Série, 34(48) (1983), p. 151. https://geodesic-test.mathdoc.fr/item/PIM2_1983__34(48)_257662/