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4. Baldwin, J.F.: The Management of Fuzzy and Probabilistic Uncertainties for Knowledge Based Systems. In: Shapiro, S.A. (ed.) Encyclopedia of AI, 2nd edn., pp. 528–537. John Wiley, Chichester (1992)
5. Baldwin, J.F.: Support Logic Programming. In: Jones, A., et al. (eds.) Fuzzy Sets - Theory and Applications, pp. 133–170. D. Reidel, Dordrecht (1986)