TY  - JOUR
AU  - V. M. Kopytov
TI  - The solvability of the occurrence problem in finitely generated
JO  - Algebra i logika
PY  - 1968
SP  - 53
EP  - 63
VL  - 7
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1968_7_6_a1/
LA  - ru
ID  - AL_1968_7_6_a1
ER  -