%0 Journal Article
%A A. I. Budkin
%T Semivarieties and Schreier varieties of unary algebras
%J Matematičeskie zametki
%D 1974
%P 263-270
%V 15
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1974_15_2_a11/
%G ru
%F MZM_1974_15_2_a11