TY  - JOUR
AU  - A. I. Budkin
TI  - Semivarieties and Schreier varieties of unary algebras
JO  - Matematičeskie zametki
PY  - 1974
SP  - 263
EP  - 270
VL  - 15
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1974_15_2_a11/
LA  - ru
ID  - MZM_1974_15_2_a11
ER  -