%0 Journal Article
%A E. S. Lyapin
%T Defining relations of semigroups of all directed transformations of an~ordered finite set
%J Matematičeskie zametki
%D 1968
%P 657-662
%V 3
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1968_3_6_a4/
%G ru
%F MZM_1968_3_6_a4