TY  - JOUR
AU  - A. N. Trakhtman
TI  - Covering elements in the lattice of varieties of algebras
JO  - Matematičeskie zametki
PY  - 1974
SP  - 307
EP  - 312
VL  - 15
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1974_15_2_a16/
LA  - ru
ID  - MZM_1974_15_2_a16
ER  -