@Article{JGAA-448,
   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},
   year = {2017},
   volume = {21},
   number = {6},
   pages = {1027--1038},
   doi = {10.7155/jgaa.00448}
}