5. Nauk,D., Klawoon,F., and Kruse, R.1997. *Foundations of Neuro-Fuzzy Systems*, John Wiley and Sons 6. Owladeghaffari, H., Shahrair, K. & Pedrycz, W. 2008. Graphical Estimation of Permeability Using RST&NFIS, *NAFIPS 2008 New York, May 19-22, available at: http://arxiv.org/* 
7. Owladeghaffari,H, Sharifzadeh,M., Shahrair,K.&Bakhtavar,E..2008. Modeling in rock engineering based on information granulation theory", Accepted in "*42nd U.S. Rock Mechanics Symposium & 2nd U.S.-Canada Rock Mechanics Symposium*, San Francisco, CD-ROM. 

8. Pakalnis, R., Poulin, R.andHadjieorgiou, J.1995.Quantifying the Cost of Dilution in Underground Mines, SME Annual Metallurgy and Exploration, Denver. 

9. Pal, S.K. & Mitra, P. 2004. *Pattern Recognition Algorithms for Data Mining*.Ch man&Hall/CRC:Boca Raton. 

10. Pawlak, Z.1982. Rough sets. *Int J Comput Inform Sci* 11: 341-356. 

11. Pawlak, Z.1991. *Rough Sets: Theoretical Aspects Reasoning about Data*. Kluwer academic, Boston. 

12. Popov, G.1971.*The Working of Mineral Deposits*, Mir Publisher, Moscow. 

13. φhm, A., Komorowski, J., Skowron, A., and Synak, P.1998. The ROSSETA software system, L.Polkowski and A.Skowron (Eds), *Rough Sets in Knowledge Discovery 2: Applications, Case* Studies and Software Systems, Physica-Verlag Heidelberg, pp: 572-576. 