Lance.E2.80.93Williams algorithms Ward's method

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^ cormack, r. m. (1971), review of classification , journal of royal statistical society, series a, 134(3), 321-367.
^ gordon, a. d. (1999), classification, 2nd edition, chapman , hall, boca raton.
^ milligan, g. w. (1979), ultrametric hierarchical clustering algorithms , psychometrika, 44(3), 343–346.






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