Hong, Seok-Hee, Nikola Nikolov, and Alexandre Tarassov. “A 2.5D Hierarchical Drawing of Directed Graphs”. Journal of Graph Algorithms and Applications 11, no. 2 (January 1, 2007): 371–396. Accessed September 28, 2024. https://jgaa.info/index.php/jgaa/article/view/paper151.