TY  - JOUR
AU  - N. K. Zamov
AU  - V. I. Sharonov
TI  - The strengthening of formulae that are provable in propositional calculus
JO  - Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki
PY  - 1969
SP  - 21
EP  - 31
VL  - 129
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/UZKU_1969_129_4_a2/
LA  - ru
ID  - UZKU_1969_129_4_a2
ER  -