@article{JGAA_2013_17_7_a0,
     author = {David Eppstein and Joseph Simons},
     title = {Confluent {Hasse} {Diagrams}},
     journal = {Journal of graph algorithms and applications},
     pages = {689--710},
     year = {2013},
     volume = {17},
     number = {7},
     doi = {10.7155/jgaa.00312},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00312/}
}