1. O. Castillo, P. Melin, Type-2 fuzzy logic theory and applications, Berlin,
2. Y. Chen, D. Z. Wang, S. C. Tong, Forecasting studies by designing Mamdani interval type-2 fuzzy logic
3. J. M. Mendel, General type-2 fuzzy logic systems made
4. X. W. Liu, J. M. Mendel, D. R. Wu, Study on enhanced Karnik-Mendel
5. A. Khosravi, S. Nahavandi, Load forecasting using interval type-2 fuzzy logic