1. A note on the addition of fuzzy variables;Alsina;Unpublished report,1978
2. On non-distributive logical connectives for fuzzy sets theory;Alsina;Busefal,1980
3. Rating and ranking of multiple aspect alternatives using fuzzy sets;Baas;Automatica,1977
4. Fuzzy relation equations on a finite set;Czogala;Fuzzy Sets and Systems,1982
5. Entropy and energy measure characterization of resolution of some fuzzy relational equations;Di Nola;Busefal,1982