A Clustering Method for Nominal and Numerical Data Based on Rough Set Theory. - Shoji Hirano; Shusaku Tsumoto; Tomohiro Okuzaki; Yutaka Hata (JSAI Workshops, 2001)

A Clustering Method Based on Rough Sets and Its Application to Knowledge Discovery in the Medical Database. - Shoji Hirano; Shusaku Tsumoto; Tomohiro Okuzaki; Yutaka Hata (MedInfo, 2001)

A Rough Set-Based Clustering Method with Modification of Equivalence Relations. - Shoji Hirano; Tomohiro Okuzaki; Yutaka Hata; Shusaku Tsumoto; Kouhei Tsumoto (PAKDD, 2001)