%0 Journal Article
%A A. A. Letichevskii
%T Equivalence of ultimate state automata relative to a free semigroup with right zero
%J Doklady Akademii Nauk
%D 1968
%P 1007-1009
%V 182
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1968_182_5_a5/
%G ru
%F DAN_1968_182_5_a5