Hartung, Sepp, Jiong Guo, Christian Komusiewicz, Rolf Niedermeier, and Johannes Uhlmann. “Exact Algorithms and Experiments for Hierarchical Tree Clustering”. Proceedings of the AAAI Conference on Artificial Intelligence 24, no. 1 (July 3, 2010): 457–462. Accessed May 21, 2026. https://ojs.aaai.org/index.php/AAAI/article/view/7684.