@article{JGAA_2008_12_3_a1,
     author = {Walter Didimo and Francesco Giordano and Giuseppe Liotta},
     title = {Overlapping {Cluster} {Planarity}},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {267--291},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {2008},
     doi = {10.7155/jgaa.00167},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00167/}
}