%0 Journal Article
%A K. Yu. Gorbunov
%T Context-free deducibility of graphs that do not realize a planar
%J Doklady Akademii Nauk
%D 1991
%P 270-274
%V 316
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1991_316_2_a1/
%G ru
%F DAN_1991_316_2_a1