Crossing number, pair-crossing number, and expansion.

Petr Kolman Jirí Matousek Crossing number, pair-crossing number, and expansion. 99-113 2004 92 J. Comb. Theory, Ser. B 1 http://dx.doi.org/10.1016/j.jctb.2003.09.002 db/journals/jct/jctb92.html#KolmanM04