ATHENSTÄDT, Jan Christoph; CORNELSEN, Sabine. Planarity of Overlapping Clusterings Including Unions of Two Partitions. Journal of Graph Algorithms and Applications, [S. l.], v. 21, n. 6, p. 1057–1089, 2017. DOI: 10.7155/jgaa.00450. Disponível em: https://jgaa.info/index.php/jgaa/article/view/paper450. Acesso em: 30 jun. 2024.