6Andrea Vattani.k_means Requires Exponentially Many Iterations[J]. Discrete Comput Geom, 2011(45).
7Ching-Hsue Cheng. Classifying the Segmentation of Customer Value Via RFM Model and RS theory[J]. Expert Systems with Applica- tions, 2009(36).
8Wishart D.K-meansClustering with Outlier Detection[C].Proc.of the 25th Annum Conf.of the German Classification Society. Munich, Germany: University of Munich Press,2001:14-16.
