1. Possibility Theory;Dubois,1988
2. Basic issues on fuzzy rules and their application to fuzzy control;Dubois,1991
3. Are grades of membership probabilities?;Hisdal;Fuzzy Sets and Systems,1988
4. M-valued sets and sheaves over integral commutative CL-monoids;Höhle,1992
5. Fuzzy control und Ununterscheidbarkeit;Höhle,1992