1. Pawlak, Z.: Rough logic. Bulletin of the Polish Academy of Sciences, Technical Sciences 5-6, 253–258 (1987)
2. Zadeh, L.A.: Fuzzy sets and information granularity. In: Gupta, M.M., Ragade, R., Yager, R. (eds.) Advances in Fuzzy Set Theory and Applications, pp. 3–18. North-Holland, Amsterdam (1979)
3. Lin, T.Y.: Granular computing on binary relations I: Data mining and neighborhood systems. In: Skowron, A., Polkowski, L. (eds.) Rough Sets in Knowledge Discovery, pp. 107–121. Physica-Verlag, Berlin (1998)
4. Lin, T.Y.: From rough sets and neighborhood systems to information granulation and computing in Words. In: Proceedings of European Congress on Intelligent Techniques and Soft Computing, pp. 1602–1606 (1997)
5. Lin, T.Y.: Granular computing on binary relations II: Rough set representations and belief functions. In: Skowron, A., Polkowski, L. (eds.) Rough Sets in Knowledge Discovery, Physica-Verlag, Berlin (1998)