1. Anderberg, M.R. 1973. Cluster Analysis for Applications. Academic Press, New York.
2. Arabie, P. and S.A. Boorman. 1973. Multidimensional scaling of measures of distance between partitions. J. Math. Psychol. 10: 148–203.
3. Bezdek, J.C. 1987. Some non-standard clustesring algorithms. In: P. Legendre and L. Legendre (eds), Developments in Numerical Ecology, pp. 225–287. Springer, New York.
4. Bruynooghe, M. 1978. Classification ascendante hierarchique des grands ensembles de données: un algorithme rapide fonde sur la construction des voisinages reductibles. Les Cahiers de L’Analyse des Données 3: 7–33.
5. Cormack, R.M. 1971. A review of classification. J. Roy. Stat. Soc. A, 134: 321–367.