%0 Journal Article
%A V. A. Gurvich
%T Positional structures and chromatic graphs
%J Doklady Akademii Nauk
%D 1992
%P 828-831
%V 322
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1992_322_5_a1/
%G ru
%F DAN_1992_322_5_a1