Rosenkrantz, Daniel J., Madhav Marathe, S. S. Ravi, and Richard E. Stearns. “Synchronous Dynamical Systems on Directed Acyclic Graphs: Complexity and Algorithms”. Proceedings of the AAAI Conference on Artificial Intelligence 35, no. 13 (May 18, 2021): 11334-11342. Accessed April 23, 2024. https://ojs.aaai.org/index.php/AAAI/article/view/17351.