Improving the Crossing Lemma by Finding More Crossings in Sparse Graphs
Janos Pach, Rados Radoicic, Gabor Tardos and Geza Toth
Discrete and Computational Geometry
Volume 36, Number 4 / December, 2006
Pages 527-552
http://dx.doi.org/10.1007/s00454-006-1264-9
SoCG2004の特集号から.
交差数補題 (crossing lemma) の係数の改善を行なっている.