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2. von Mises, R., “On the classification of observation data into distinct groups,”Ann. Math. Slat., Vol. 16 (1945), pp. 68–73.
3. Rao, C. Radhakrishna,Advanced Statistical Methods in Biometric Research, John Wiley & Sons, Inc. (1952), Chap. 8, pp. 273–350. (Many references are given at the end of this chapter).
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