TY  - JOUR
AU  - M. F. Raţă
TI  - Nontabularity of the logic ${\rm S}4$ with respect to
JO  - Algebra i logika
PY  - 1982
SP  - 283
EP  - 320
VL  - 21
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1982_21_3_a2/
LA  - ru
ID  - AL_1982_21_3_a2
ER  -