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Siemer, J.A.: ¬An information retrieval expert system prototype for agricultural literature reference database-description and evaluation (1994)
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- Bonn : Universität, Institut für landwirtschaftliche Betriebslehre
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Siemer, J.A.: ¬A conceptual model for an information retrieval expert system prototype for agricultural bibliographic literature databases (1994)
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- Bonn : Universität, Institut für landwirtschaftliche Betriebslehre
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Siemer, J.A.: ¬A functional model for an information retrieval expert system for agricultural literature reference databases (1994)
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- Bonn : Universität, Institut für landwirtschaftliche Betriebslehre
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Siemer, J.A.: ¬The knowledge for a detailed conceptual model for an information retrieval expert system (1994)
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- Bonn : Universität, Institut für landwirtschaftliche Betriebslehre
