1. The following references are relevant to the various parts of this paper.
2. Arabie, P., Hubert, L.J. and De Soete, G. (1996) ed.: Clustering and Classification, World Scientific.
3. Benzécri, J.P. (1973): L’Analyse des Données,Dunod.
4. Benzécri, J.P. (1992): Correspondence Analysis Hand-Book, Marcel Dekker.
5. Bock, H.-H. and Polasek, W. (1996) ed.: Data Analysis and Information Systems, Springer.