de Fraysseix, Hubert, and Patrice Ossona de Mendez. “On Cotree-Critical and DFS Cotree-Critical Graphs”. Journal of Graph Algorithms and Applications 7, no. 4 (January 1, 2003): 411–427. Accessed May 1, 2025. https://www.jgaa.info/index.php/jgaa/article/view/paper77.