1. Komorowski, J., Polkowski, L., Skowron, A.: Rough Sets: A Tutorial
2. Swiniarski, R.W.: Rough Set Methods in Feature Reduction and Classification. Int. Appl. Math. Comput. Sci. 11(3), 565–582 (2001)
3. Zhong, N., Dong, J., Ohsuga, S.: Using Rough Sets with Heuristic for Feature Selection. Journal of Intelligent Information System 16, 199–214 (2001)
4. Hoa, N.S., Son, N.H.: Institute of Computer Sciences, Wasaw University, Poland. Some Efficient Algorithms for Rough Set Methods
5. Turk, M., Pentland, A.: Eigenfaces for Recognition (1991)