Castelló, Rodolfo, Rym Mili, and Ioannis Tollis. “A Framework for the Static and Interactive Visualization of Statecharts”. Journal of Graph Algorithms and Applications 6, no. 3 (January 1, 2002): 313–351. Accessed June 30, 2024. https://jgaa.info/index.php/jgaa/article/view/paper56.