1. Validity measures for fuzzy partitions;Back,1995
2. Modern Information Retrieval;Baeza-Yates,1999
3. Pattern Recognition with Fuzzy Objective Function Algorithms;Bezdek,1981
4. Principal direction divisive partitioning;Boley;Data Mining and Knowledge Discovery,1998
5. Incremental hierarchical fuzzy clustering for category-based news filtering;Bordogna,2008