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3. Jürgen Dorn and Reza Shams: “An Expert System for Scheduling in a Steelmaking Plant” In: Proceedings of the World Congress on Expert Systems, Orlando Fla., Pergamon Press, 1991.
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5. Didier Dubois and Henri Prade: “Processing Fuzzy Temporal Knowledge” In: IEEE Transactions on Systems, Man, and Cybernetics, Vol. 19, No. 4, pp 729–744, July/August 1989.