Relational classes and their characterizations
Archivum mathematicum, Tome 16 (1980) no. 4, pp. 199-203 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Chajda, Ivan. Relational classes and their characterizations. Archivum mathematicum, Tome 16 (1980) no. 4, pp. 199-203. http://geodesic.mathdoc.fr/item/ARM_1980_16_4_a2/

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