- Thorndike, Robert L, Who belongs in the family?, Psychometrika18.4 (1953): 267-276.
- Steinhaus, H, Sur la division des corp materiels en parties. Bull. Acad. Polon. Sci 1 (1956): 801–804.
- MacQueen, James, Some methods for classification and analysis of multivariate observations. Proceedings of the fifth Berkeley symposium on mathematical statistics and probability. Vol. 1. No. 14. 1967.
- Cover, Thomas, and Peter Hart, Nearest neighbor pattern classification. IEEE transactions on information theory 13.1 (1967): 21-27.
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