Learning a coverage set of multiple-level certain and possible rules by rough sets. - Tzung-Pei Hong; Chun-E Lin; Jiann-Horng Lin; Shyue-Liang Wang (SMC, 2003)

Learning cross-level certain and possible rules by rough sets. - Tzung-Pei Hong; Chun-E Lin; Jiann-Horng Lin; Shyue-Liang Wang (Expert Syst. Appl., 2008)