Hambrusch, Susanne, Chuan-Ming Liu, and Hyeong-Seok Lim. “Clustering in Trees: Optimizing Cluster Sizes and Number of Subtrees”. Journal of Graph Algorithms and Applications 4, no. 4 (January 1, 2000): 1–26. Accessed May 1, 2025. https://www.jgaa.info/index.php/jgaa/article/view/paper31.