@article{JGAA_2017_21_6_a4,
     author = {Jan Christoph Athenst\"adt and Sabine Cornelsen},
     title = {Planarity of {Overlapping} {Clusterings} {Including} {Unions} of {Two} {Partitions}},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {1057--1089},
     publisher = {mathdoc},
     volume = {21},
     number = {6},
     year = {2017},
     doi = {10.7155/jgaa.00450},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00450/}
}