Wenceslas Fernandez de la Vega, Marek Karpinski, Claire Kenyon, Yuval Rabani. Approximation schemes for clustering problems. In Proceedings of the 35th Annual ACM Symposium on Theory of Computing, June 9-11, 2003, San Diego, CA, USA. pages 50-58, ACM, 2003. [doi]
Abstract is missing.