@Article{JGAA-88,
   author = {{Wilhelm} {Barth} and {Petra} {Mutzel} and {Michael} {Jünger}},
   title = {Simple and Efficient Bilayer Cross Counting},
   journal = {Journal of Graph Algorithms and Applications},
   year = {2004},
   volume = {8},
   number = {2},
   pages = {179--194},
   doi = {10.7155/jgaa.00088}
}