1. Mishkoff, H.: Understanding artificial intelligence. Instrument learning Centre, Dallas, Texas (1985)
2. Zadeh, L.A.: Computing with words and perceptions a paradigm shift. In: 2009 Proceedings of the IEEE International Conference on Information Reuse and Integration, Las Vegas, Nevada, USA, pp. 450–452. IEEE Press (2009)
3. Sayedah, T., Tawfik, S., Zaki, Y.: Developing an expert system for diabetics’ treatment advices. Int. J. Hosp. Res. 2(3), 155–162 (2013)
4. Patel, T.: Knowledge models, knowledge acquisition techniques and developments. Orient. J. Comput. Sci. Technol. 6(4), 467–472 (2013)
5. Aliev, R.A., Fazlollahi, B., Aliev, R.R.: Soft Computing and its Application in Business and Economics, p. 446. Springer, Heidelberg (2004)