The CLUSTER Procedure

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Wong, M. A. and Lane, T. (1983), “A kth Nearest Neighbor Clustering Procedure,” Journal of the Royal Statistical Society, Series B, 45, 362–368.

Wong, M. A. and Schaack, C. (1982), “Using the kth Nearest Neighbor Clustering Procedure to Determine the Number of Subpopulations,” American Statistical Association Proceedings of the Statistical Computing Section, 40–48.