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Le Van Bao; Thuan Ho: Key and superkey for a closure function. In: Acta cybernetica, (9) 1. pp. 73-82. (1989)
Thuan Ho: Some remarks on the algorithm of Lucchesi and Osborn. In: Acta cybernetica, (8) 2. pp. 191-193. (1987)
Thuan Ho; Le Van Bao: Some results about keys of relational schemas. In: Acta cybernetica, (7) 1. pp. 99-113. (1985)