Ding G. Disjoint paths in a planer graph - a general theorem / G.Ding,A.Schrijver,P.D.Seymour, 1990. - 5 p. - Текст : непосредственный.
Ding G. Disjoint cycles in directed graphs on the torus and the Klein bottle / G.Ding,A.Schrijver,P.D.Seymour, 1990. - 5 p. - Текст : непосредственный.