TY  - JOUR
AU  - A. D. Yashin
TI  - On the number of new logical constants in intuitionistic propositional calculus
JO  - Vestnik Moskovskogo universiteta. Matematika, mehanika
PY  - 1997
SP  - 7
EP  - 10
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VMUMM_1997_1_a1/
LA  - ru
ID  - VMUMM_1997_1_a1
ER  -