HALUPCZOK, Immanuel; SCHULZ, André. Pinning balloons with perfect angles and optimal area. Journal of Graph Algorithms and Applications, [S. l.], v. 16, n. 4, p. 847–870, 2012. DOI: 10.7155/jgaa.00280. Disponível em: https://jgaa.info/index.php/jgaa/article/view/paper280. Acesso em: 30 jun. 2024.