1. “Sequential clustering by statistical methodology,”;Amador;Pattern Recognition Letters,2005
2. Cluster Analysis for Applications;Anderberg,1973
3. “Data analysis in social sciences,”;Ball,1965
4. “A survey of fuzzy clustering algorithms for pattern recognition, Parts I and II,”;Baraldi;IEEE Transactions on Systems, Man and Cybernetics, B. Cybernetics,1999
5. Baraldi A., Schenato L. “Soft-to-hard model transition in clustering: a review,” Technical Report TR-99-010, 1999.