CHIMANI, Markus; HUNGERLÄNDER, Philipp. Multi-level Verticality Optimization: Concept, Strategies, and Drawing Scheme. Journal of Graph Algorithms and Applications, [S. l.], v. 17, n. 3, p. 329–362, 2013. DOI: 10.7155/jgaa.00296. Disponível em: https://jgaa.info/index.php/jgaa/article/view/paper296. Acesso em: 29 jun. 2024.