Matthew Newton Ondrej Sýkora Martin Uzovic Imrich Vrto New Exact Results and Bounds for Bipartite Crossing Numbers of Meshes. 360-370 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3383&spage=360 2004 conf/gd/2004 Graph Drawing db/conf/gd/gd2004.html#NewtonSUV04