@article{JGAA_2017_21_6_a2,
     author = {Daniel Summer Magruder and Stefan Bonn},
     title = {Root demotion: efficient post-processing of layered graphs to reduce dummy vertices for hierarchical graph drawing},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {1027--1038},
     publisher = {mathdoc},
     volume = {21},
     number = {6},
     year = {2017},
     doi = {10.7155/jgaa.00448},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00448/}
}