1. Butz, C.J., Yan, W. & Yang, W., (2005). The Computational Complexity of Inference Using Rough Set Flow Graphs, Rough Sets Fuzzy Sets Data Mining and Granular Computing 2005, Lecture Notes in Artificial Intelligence, 3641, Springer Verlag, Berlin, 335 – 344.
2. Butz, C.J., Yan, W. & Yang, W., (2006). An Efficient Algorithms for Inference in Rough Set Flow Graphs, Transaction on Rough Sets V, Lecture Notes in Computer Science, 4100, Springer Verlag, Berlin, 102-122.
3. Chien, C.C. & Tsumoto, S., (2007). On Learning Decision Rules from Flow Graphs, In Proc. of North America Fuzzy Information Processing Society, 655 – 658.
4. Chitchoreon, D. & Pattaraintakorn, P., (2008a). Knowledge Discovery by Rough Sets Mathematical Flow Graphs and its Extension, In Proc. of the 26th IAESTED Int. Conf. on AI and Applications AIA’ 08, ACTA Press, 340 – 345.
5. Chitchoreon, D. & Pattaraintakorn, P., (2008b). Towards Theories of Fuzzy Sets and Rough Set to Flow Graphs, In Proc. of the 2008 IEEE World Congress on Computational Intelligence, Hong Kong, 1675 – 1682.