DIDIMO, Walter. Upward Planar Drawings and Switch-regularity Heuristics. Journal of Graph Algorithms and Applications, [S. l.], v. 10, n. 2, p. 259–285, 2006. DOI: 10.7155/jgaa.00127. Disponível em: http://jgaa-v4.cs.brown.edu/index.php/jgaa/article/view/paper127. Acesso em: 6 jul. 2024.