1. J. Aczél, Lectures on Functional Equations and Their Applications, Academic Press, New York, 1966.
2. Validation, verification and testing of computer software;Adrion;Comp. Surveys,1982
3. Social Choice and Individual Values;Arrow,1951
4. SYCOJET and SACCO, Two tools for verifying expert systems;Ayel;Int. J. Exp. Systems,1993
5. Social choice axioms for fuzzy set aggregation;Dubois;Fuzzy Sets and Systems,1991