1. Ahrens HJ (1974) Multidimensional Skalierung. Beltz Verlag, Weinheim
2. Anderberg MR (1973) Cluster analysis for applications. Academic Press, New York
3. Astie A (1973) Comparaisons par paires. Recherche d'un classement ou d'un ensemble de classements des objects comparés. Rev Stat Appl 21:51–63
4. Baker FB (1974) Stability of two hierarchical grouping techniques. Case I: Sensitivity to data errors. J Am Stat Assoc 69:440–445
5. Baker FB, Hubert LJ (1975) Measuring the power of hierarchical cluster analysis. J Am Stat Assoc 70:31–38