Christoph Buchheim Dietmar Ebner Michael Jünger Gunnar W. Klau Petra Mutzel René Weiskircher Exact Crossing Minimization. 37-48 2005 conf/gd/2005 Graph Drawing http://dx.doi.org/10.1007/11618058_4 db/conf/gd/gd2005.html#BuchheimEJKMW05