@Article{JGAA-242,
   author = {{Christian} {Bachmaier} and {Franz} J. {Brandenburg} and {Wolfgang} {Brunner} and {Ferdinand} {Hübner}},
   title = {Global k-Level Crossing Reduction},
   journal = {Journal of Graph Algorithms and Applications},
   year = {2011},
   volume = {15},
   number = {5},
   pages = {631--659},
   doi = {10.7155/jgaa.00242}
}