TY  - JOUR
AU  - Yu. G. Ventsov
TI  - Effective selection operations on constructive and positive

JO  - Algebra i logika
PY  - 1993
SP  - 45
EP  - 53
VL  - 32
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1993_32_1_a3/
LA  - ru
ID  - AL_1993_32_1_a3
ER  -