@article{JGAA_2013_17_3_a7,
     author = {Markus Chimani and Philipp Hungerl\"ander},
     title = {Multi-level {Verticality} {Optimization:} {Concept,} {Strategies,} and {Drawing} {Scheme}},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {329--362},
     publisher = {mathdoc},
     volume = {17},
     number = {3},
     year = {2013},
     doi = {10.7155/jgaa.00296},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00296/}
}