Abuthawabeh, Ala, and Dirk Zeckzer. “Topological Decomposition of Directed Graphs”. Journal of Graph Algorithms and Applications 21, no. 4 (February 1, 2017): 589–630. Accessed December 6, 2025. https://jgaa-v5.cs.brown.edu/index.php/jgaa/article/view/paper431.