1. Anderberg, M.R.: Cluster Analysis for Applications. Academic Press, New York (1973)
2. Hartigan, J.A.: Clustering Algorithms. Wiley, New York (1975)
3. Jambu, M.: Classification automatique pour l’analyse des donnees. Bordas, Paris (1978)
4. Mirkin, B.: Mathematical Classification and Clustering. Kluwer Academic Publishers, Dordrecht (1996)
5. Miyamoto, S.: Cluster Analysis as a Tool of Interpretation of Complex Systems. Working paper WP-87–41. IIASA, Laxenburg (1987)