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  1. Siemer, J.A.: ¬An information retrieval expert system prototype for agricultural literature reference database-description and evaluation (1994) 10.09
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    Author
    Siemer, J.A.
  2. Siemer, J.A.: ¬A conceptual model for an information retrieval expert system prototype for agricultural bibliographic literature databases (1994) 10.09
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    Author
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  3. Siemer, J.A.: ¬A functional model for an information retrieval expert system for agricultural literature reference databases (1994) 10.09
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    Author
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  4. Siemer, J.A.: ¬The knowledge for a detailed conceptual model for an information retrieval expert system (1994) 10.09
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    Siemer, J.A.