KLAWITTER, Jonathan; MCHEDLIDZE, Tamara. Upward planar drawings with two slopes. Journal of Graph Algorithms and Applications, [S. l.], v. 26, n. 1, p. 171–198, 2022. DOI: 10.7155/jgaa.00587. Disponível em: http://jgaa-v4.cs.brown.edu/index.php/jgaa/article/view/paper587. Acesso em: 6 jul. 2024.