Figiel, Aleksander, Anne-Sophie Himmel, André Nichterlein, and Rolf Niedermeier. “On 2-Clubs in Graph-Based Data Clustering: Theory and Algorithm Engineering”. Journal of Graph Algorithms and Applications 25, no. 1 (January 1, 2021): 521–547. Accessed May 1, 2025. https://www.jgaa.info/index.php/jgaa/article/view/paper570.