%0 Journal Article
%A G. G. Ponomarenko
%T On $r$-indistinguishability of finite automata
%J Doklady Akademii Nauk
%D 1982
%P 806-807
%V 267
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1982_267_4_a10/
%G ru
%F DAN_1982_267_4_a10