%0 Journal Article
%A D. Bienstock
%T Some Provably Hard Crossing Number Problems.
%J Discrete & computational geometry
%D 1991
%P 443-460
%V 6
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DCG_1991__6_4_131170/
%F DCG_1991__6_4_131170