1. Zimmermann, H.J. (1987).Fuzzy Sets, Decision Making, and Expert Systems.Boston:Kluwer Academic.
2. Zha, X.F. & Sriram, R.D. (2003).Platform-based product design and development: Knowledge supportstrategy and implementation. InBusiness and Technology in the New Millennium( Leondes, C.T. , Ed.).Norwell, MA:Kluwer Academic.
3. Zha, X.F. & Lu, W.F. (2002b).Knowledge intensive support for product family design.Proc. 2002 ASME DETC02, Paper No. DETC/DAC 34098.
4. Zadeh, L.A. (1965).Fuzzy sets.Information and Control 8,338–353.
5. Wheelwright, S.C. & Sasser, W.E. (1989).The new product development map.Harvard Business Review 67(May–June),112–125.