TY  - JOUR
AU  - A. I. Budkin
TI  - Idempotents in the semigroup of quasivarieties of torsion-free groups
JO  - Matematičeskie zametki
PY  - 1990
SP  - 21
EP  - 25
VL  - 47
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a2/
LA  - ru
ID  - MZM_1990_47_5_a2
ER  -