HONG, Seok-Hee; NIKOLOV, Nikola; TARASSOV, Alexandre. A 2.5D Hierarchical Drawing of Directed Graphs. Journal of Graph Algorithms and Applications, [S. l.], v. 11, n. 2, p. 371–396, 2007. DOI: 10.7155/jgaa.00151. Disponível em: https://jgaa.info/index.php/jgaa/article/view/paper151. Acesso em: 29 jun. 2024.