The operators of logical approximation
Informatics and Automation, Mathematical logic, theory of algorithms and theory of sets, Tome 133 (1973), pp. 65-77.

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     author = {D. A. Bochvar and V. I. Fukson},
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     url = {http://geodesic.mathdoc.fr/item/TRSPY_1973_133_a7/}
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D. A. Bochvar; V. I. Fukson. The operators of logical approximation. Informatics and Automation, Mathematical logic, theory of algorithms and theory of sets, Tome 133 (1973), pp. 65-77. http://geodesic.mathdoc.fr/item/TRSPY_1973_133_a7/