FINK, Martin; PUPYREV, Sergey; WOLFF, Alexander. Ordering Metro Lines by Block Crossings. Journal of Graph Algorithms and Applications, [S. l.], v. 19, n. 1, p. 111–153, 2015. DOI: 10.7155/jgaa.00351. Disponível em: https://jgaa.info/index.php/jgaa/article/view/paper351. Acesso em: 30 jun. 2024.