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2. The use of parametric programming in fuzzy linear programming;Chanas;Fuzzy Sets and Systems,1983
3. Goal programming and multiple optimization;Charnes,1975
4. Fuzzy Sets and Systems: Theory and Applications;Dubois,1980
5. Über logische Verknüpfungen unscharfer Aussagen und deren zugehörigen Bewertungsfunktionen;Hamacher,1975