%0 Journal Article
%A N. Ya. Medvedev
%T Coverings in a lattice of $l$-varieties
%J Algebra i logika
%D 1983
%P 53-60
%V 22
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1983_22_1_a3/
%G ru
%F AL_1983_22_1_a3