%0 Journal Article
%A L. M. Martynov
%T On accessible classes of groups and semigroups
%J Sbornik. Mathematics
%D 1973
%P 231-241
%V 19
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1973_19_2_a7/
%G en
%F SM_1973_19_2_a7