Jünger, Michael, and Petra Mutzel. “2-Layer Straightline Crossing Minimization: Performance of Exact and Heuristic Algorithms”. Journal of Graph Algorithms and Applications 1, no. 1 (January 1, 1997): 1–25. Accessed December 21, 2024. https://jgaa.info/index.php/jgaa/article/view/paper1.