%0 Journal Article
%A B. V. Popov
%T Semigroups of transformations of rank not exceeding two
%J Doklady Akademii Nauk
%D 1965
%P 1019-1022
%V 161
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1965_161_5_a5/
%G ru
%F DAN_1965_161_5_a5