LIN, Chun-Cheng; YEN, Hsu-Chun. On Balloon Drawings of Rooted Trees. Journal of Graph Algorithms and Applications, [S. l.], v. 11, n. 2, p. 431–452, 2007. DOI: 10.7155/jgaa.00153. Disponível em: https://jgaa.info/index.php/jgaa/article/view/paper153. Acesso em: 29 jun. 2024.