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Beynon-Davies, P.: Expert database systems : a gentle introduction (1992)
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Ignizio, J.P.: ¬An Introduction to expert systems : the development and implementation of rule-based expert systems (1991)
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Schoenhoff, D.M.: ¬The barefoot expert : the interface of computerized knowledge systems and indigenous knowledge systems (1993)
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Handbook on ontologies (2004)
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