Acuña, Vicente, Leandro Ishi Soares de Lima, Giuseppe Italiano, Luca Pepè Sciarria, Marie-France Sagot, and Blerina Sinaimeri. “A Family of Tree-Based Generators for Bubbles in Directed Graphs”. Journal of Graph Algorithms and Applications 25, no. 1 (January 1, 2021): 563–580. Accessed July 6, 2024. http://jgaa-v4.cs.brown.edu/index.php/jgaa/article/view/paper572.