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              Everitt B, Landau S, Leese M (2001) Cluster analysis (4th ed.). Arnold, London
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              Everitt, B. S., Landau, S., and Leese, M. (2001). Cluster analysis. Arnold, London, forth edition.
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              Everitt, B., Landau, S., Leese, M., & Stahl, D. (2001). Cluster Analysis. Hoboken: Wiley.
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              Everitt, B., S. Landau & M. Leese, 2001: Cluster analysis. 4. Aufl., London-New York.
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              Everitt, B./Landau, S./Leese, M. (2001): Cluster analysis 4th ed., London: Arnold.
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