1. An, A., Shan, N., Chan, C., Cercone, N., Ziarko, W.: Discovering Rules for Water Demand Prediction: An Enhanced Rough-Set Approach. Engng. Applic. Artif. Intell. 9 (1996) 45–653
2. Fayyad, U.M., Irani, K.B.: On the Handling of Continuous-Valued Attributes in Decision Tree Generation. Machine Learning 8 (1992) 87–102
3. Katzberg, J.D., Ziarko, W.: Variable Precision Rough Sets with Asymmetric Bounds. In: Ziarko, W. (ed.): Rough Sets, Fuzzy Sets and Knowledge Discovery (1993) 167–177
4. Katzberg, J.D., Ziarko, W.: Variable precision extension of rough sets. Fundamenta Informaticae 27 (1996) 155–168
5. Kryszkiewicz, M.: Maintenance of Reducts in the Variable Rough Set Model. In: Lin, T.Y. and Cercone, N. (eds.): Rough Sets and Data Mining: Analysis of Imprecise Data, Kluwer Academic Publishers, London, (1997) 355–372