TY  - JOUR
AU  - N. Ya. Medvedev
TI  - Coverings in a lattice of $l$-varieties
JO  - Algebra i logika
PY  - 1983
SP  - 53
EP  - 60
VL  - 22
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1983_22_1_a3/
LA  - ru
ID  - AL_1983_22_1_a3
ER  -