TY  - JOUR
AU  - D. A. Bochvar
AU  - V. I. Fukson
TI  - The operators of logical approximation
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1973
SP  - 65
EP  - 77
VL  - 133
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TM_1973_133_a7/
LA  - ru
ID  - TM_1973_133_a7
ER  -