Inariba, Wataru, Takuya Akiba, and Yuichi Yoshida. “Random-Radius Ball Method for Estimating Closeness Centrality”. Proceedings of the AAAI Conference on Artificial Intelligence 31, no. 1 (February 10, 2017). Accessed May 26, 2026. https://ojs.aaai.org/index.php/AAAI/article/view/10498.