1. Komorowski, J., Pawlak, Z., Polkowski, L., Skowron, A.: Rough sets – a tutorial. In: Pal, S.K. (ed.) Rough Fuzzy Hybridization, pp. 3–98. Springer, Heidelberg (1999)
2. Lecture Notes in Computer Science;G. Cattaneo,2004
3. Lecture Notes in Computer Science;M. Inuiguchi,2004
4. Mani, A.: Rough equalities from posets and rough difference orders. Fundamenta Informaticae 53, 321–333 (2002)
5. Mani, A.: Relativised generalized rough sets and bayesian belief networks (to be Submitted, 2007)