On the operations over relations in the relational model data with two types of null values.
Pavlović, Gordana M.
Publications de l'Institut Mathématique. Nouvelle Série, Tome 33(47) (1983), p. 151-163 / Harvested from The Electronic Library of Mathematics
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Publié le : 1983-01-01
MISANU-ID : j_publ_0001236
EUDML-ID : urn:eudml:doc:257662 
@article{03919790,
     title = {On the operations over relations in the relational model data with two types of null values.},
     journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
     volume = {33(47)},
     year = {1983},
     pages = {151-163},
     zbl = {0575.68019},
     language = {en},
     url = {http://dml.mathdoc.fr/item/03919790}
}

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, Tome 33(47) (1983) pp. 151-163. http://gdmltest.u-ga.fr/item/03919790/