D. Cutting, D. Karger, J. Pedersen, and J. Tukey. SIGIR '92: Proceedings of the 15th annual international ACM SIGIR conference on Research and development in information retrieval, page 318--329. New York, NY, USA, ACM Press, (1992)
G. Frahling, and C. Sohler. SCG '06: Proceedings of the twenty-second annual symposium on Computational geometry, page 135--143. New York, NY, USA, ACM, (2006)
D. Arthur, and S. Vassilvitskii. SODA '07: Proceedings of the eighteenth annual ACM-SIAM symposium on Discrete algorithms, page 1027--1035. Philadelphia, PA, USA, Society for Industrial and Applied Mathematics, (2007)
D. Arthur, and S. Vassilvitskii. SCG '06: Proceedings of the twenty-second annual symposium on Computational geometry, page 144--153. New York, NY, USA, ACM, (2006)
D. Arthur, and S. Vassilvitskii. SODA '07: Proceedings of the eighteenth annual ACM-SIAM symposium on Discrete algorithms, page 1027--1035. Philadelphia, PA, USA, Society for Industrial and Applied Mathematics, (2007)
J. MacQueen. Proceedings of the 5th Berkeley Symposium on Mathematical Statistics and Probability - Vol. 1, page 281--297. University of California Press, Berkeley, CA, USA, (1967)
J. MacQueen. Proceedings of the 5th Berkeley Symposium on Mathematical Statistics and Probability - Vol. 1, page 281--297. University of California Press, Berkeley, CA, USA, (1967)