@article{JGAA_2006_10_2_a7,
     author = {Walter Didimo},
     title = {Upward {Planar} {Drawings} and {Switch-regularity} {Heuristics}},
     journal = {Journal of graph algorithms and applications},
     pages = {259--285},
     year = {2006},
     volume = {10},
     number = {2},
     doi = {10.7155/jgaa.00127},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00127/}
}