On a Rough Sets Based Tool for Generating Rules from Data with Categorical and Numerical Values. - Hiroshi Sakai; Kazuhiro Koba; Ryuji Ishibashi; Michinori Nakata (MDAI, 2007)

On Possible Rules and Apriori Algorithm in Non-deterministic Information Systems: Part 2. - Hiroshi Sakai; Ryuji Ishibashi; Kazuhiro Koba; Michinori Nakata (RSFDGrC, 2007)

Lower and Upper Approximations of Rules in Non-deterministic Information Systems. - Hiroshi Sakai; Ryuji Ishibashi; Michinori Nakata (RSCTC, 2008)

Rules and Apriori Algorithm in Non-deterministic Information Systems. - Hiroshi Sakai; Ryuji Ishibashi; Kazuhiro Koba; Michinori Nakata (Trans. Rough Sets, 2008)