LIN, Chun-Cheng; KAO, Hao-Jen; YEN, Hsu-Chun. Many-to-One Boundary Labeling. Journal of Graph Algorithms and Applications, [S. l.], v. 12, n. 3, p. 319–356, 2008. DOI: 10.7155/jgaa.00169. Disponível em: https://jgaa.info/index.php/jgaa/article/view/paper169. Acesso em: 30 jun. 2024.