TY  - JOUR
AU  - A. A. Shum
TI  - Relative varieties of algebraic systems and propositional calculi
JO  - Doklady Akademii Nauk
PY  - 1985
SP  - 538
EP  - 541
VL  - 282
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1985_282_3_a6/
LA  - ru
ID  - DAN_1985_282_3_a6
ER  -