TY  - JOUR
AU  - I. A. Lavrov
TI  - The effective non-separability of the set of identically true
JO  - Algebra i logika
PY  - 1963
SP  - 5
EP  - 18
VL  - 2
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1963_2_1_a0/
LA  - ru
ID  - AL_1963_2_1_a0
ER  -