HARRIGAN, Martin; HEALY, Patrick. Using a Significant Spanning Tree to Draw a Directed Graph. Journal of Graph Algorithms and Applications, [S. l.], v. 12, n. 3, p. 293–317, 2008. DOI: 10.7155/jgaa.00168. Disponível em: https://jgaa.info/index.php/jgaa/article/view/paper168. Acesso em: 30 jun. 2024.