1. Sreekumar, Panda, B.: Business intelligence: an overview. J. IPM, 5(2), 28–32 (2005)
2. Dubois, D., Prade, H., Pawlak, Z.: Foreword. Rough Sets: Theoretical Aspects of Reasoning about Data. Kluwer, Dordrecht (1991)
3. Grzymala-Busse, J.W.: Knowledge acquisition under uncertainty—A rough set approach. J. Intel. Rob. Syst. 1(1), 3–16 (1988). Grzymala-Busse, J.W.: Managing Uncertainty in Expert Systems. Kluwer, Dordrecht (1991)
4. Skowron, A., Rauszer, C.: The discernibility matrices and functions in information systems. In: Slowinski, R. (ed.) Intelligent Decision Support. Handbook of Advances and Applications of the Rough Set Theory, pp. 331–362. Kluwer, Dordrecht (1992)
5. Pawlak, Z.: Rough Sets. Institute of Theoretical and Applied Informatics, Polish Academy of Sciences, Poland (1982)