%0 Journal Article
%A S. S. Marchenkov
%T Definition of positively closed classes by endomorphism semigroups
%J Diskretnaya Matematika
%D 2012
%P 19-26
%V 24
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DM_2012_24_4_a1/
%G ru
%F DM_2012_24_4_a1