1. Using fuzzy rule based economic models to measure the performance of state funded agencies;Ammar,1997
2. Fuzzy logic: a case study in performance measurement;Ammar,1997
3. Grading the states;Barrett;Governing,1999
4. Fuzzy models — what are they, and why?;Bezdek;IEEE Transactions on Fuzzy Systems,1993
5. Possibility Theory;Dubois,1988