1. Logic: going further from Tarski;Trillas;Fuzzy Sets Syst.,1992
2. An inquiry into indistinguishability operators;Trillas,1984
3. On implication and indistinguishability in the settings of fuzzy logic;Trillas,1985
4. Approximate Reasoning Models;López de Mántaras,1990
5. Probabilistic Metric Spaces;Schweizer,1983