1. G. Hirt, R. Cremer, A. Winkelmann, T. Witulski, M. Zillgen, SSM – forming of usually wrought aluminium alloys, Proc. 3rd Internat. Conf. on the Semi Solid Processing of Alloys and Composites, 1994.
2. Y.-H. Lee, A. Lieb, H. Wiegels, R. Kopp, Application of fuzzy logic to control a forging machine, Stahl u. Eisen 114 (11) (1994) 93–99 (in German).
3. E.H. Mamdani, Application of fuzzy logic to approximate reasoning using linguistic synthesis, IEEE Trans. Computers C-26 (12) (1977) 1182–1191.
4. Fuzzy identification of systems and its application to modelling and control;Takagi;IEEE Trans. Systems Man Cybernet.,1985
5. R.R. Yager (Ed.), Fuzzy Sets and Applications: Selected Papers by L. Zadeh, Wiley, New York, 1987.