Geodesic
The operators of logical approximation
Trudy Matematicheskogo Instituta imeni V.A. Steklova, 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},
     title = {The operators of logical approximation},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {65--77},
     publisher = {mathdoc},
     volume = {133},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1973_133_a7/}
}
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D. A. Bochvar; V. I. Fukson. The operators of logical approximation. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Mathematical logic, theory of algorithms and theory of sets, Tome 133 (1973), pp. 65-77. http://geodesic.mathdoc.fr/item/TM_1973_133_a7/