TY  - JOUR
AU  - Ya. S. Smetanich
TI  - On statement calculi with an additional operation
JO  - Doklady Akademii Nauk
PY  - 1961
SP  - 309
EP  - 312
VL  - 139
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1961_139_2_a12/
LA  - ru
ID  - DAN_1961_139_2_a12
ER  -