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Hansen, P., Jaumard, B., & Simeone, B. (2002). Polynomial algorithms for nested univariate clustering. Discrete Mathematics, 245(1-3), 93-105. Lien externe
Hansen, P., Jaumard, B., & Simeone, B. (1996). Espaliers: A generalization of dendrograms. Journal of Classification, 13(1), 107-127. Lien externe