%0 Journal Article
%A A. V. Levichev
%T On a connected preorder
%J Doklady Akademii Nauk
%D 1977
%P 1256-1259
%V 235
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1977_235_6_a4/
%G ru
%F DAN_1977_235_6_a4