1. Faktorenanalyse;Überla,1971
2. Outline of a new approach to the analysis of complex systems and decision processes;Zadeh;IEEE Trans. on Systems, Man and Cybernetics,1973
3. Fuzzy balance problem;Dohnal,1981
4. Fuzzy models of unit operations and chemical plants;Dohnal,1981
5. Optimization of chemical processes;Hartmann,1981