1. R. Agrawal, T. Imieliński, A. Swami, Mining association rules between sets of items in large databases, in: Proceedings of ACM SIGMOD, Washington, DC, USA, 1993, pp. 207–216.
2. R. Agrawal, R. Srikant, Fast algorithms for mining association rules, in: Proceedings of the VLDB Conference, 1994, pp. 487–499.
3. Cluster Analysis for Applications;Anderberg,1973
4. Web mining: a survey in the fuzzy framework;Arotaritei;Fuzzy Sets and Systems,2004
5. S. Auephanwiriyakul, J.M. Keller, A. Adrian, Management questionnaire analysis through a linguistic hard C-means, in: Fuzzy Information Processing Society, NAFIPS, 19th International Conference of the North American, Atlanta, GA, USA, 2000, pp. 402–406.