1. Fuzzy sets;Zadeh;Information and Control,1965
2. R. Sambuc, Fonctions ϕ-floues: Application á l’aide au diagnostic en pathologie thyroidienne, Ph.D. thesis, Faculté de Médecine de Marseille, (in French), 1975.
3. The concept of a linguistic variable and its application to approximate reasoning–i;Zadeh;Information Sciences,1975
4. Intuitionistic fuzzy sets;Atanassov;Fuzzy Sets and Systems,1986
5. Intuitionistic Fuzzy Sets: Theory and Applications;Atanassov,1999