@Article{JGAA-262,
   author = {{Vassilis} {Tsiaras} and {Ioannis} G. {Tollis}},
   title = {DAGmaps and ε-Visibility Representations for DAGs: Algorithms and Characterizations},
   journal = {Journal of Graph Algorithms and Applications},
   year = {2012},
   volume = {16},
   number = {2},
   pages = {359--380},
   doi = {10.7155/jgaa.00262}
}