@articleAckermann_Blömer_Sohler_2010, title=Clustering for Metric and Nonmetric Distance Measures, DOI=10.1145/1824777.1824779, number=4, journal=ACM Trans. Algorithms, author=Ackermann, Marcel R. and Blömer, Johannes and Sohler, Christian, year=2010, pages=59:1--59:26