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  1. Derr, R.L.: Questions: definitions, structure, and classification (1985) 9.91 
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  2. Derr, R.L.: ¬The concept of information in ordinary discourse (1985) 9.91 
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  3. Derr, R.L.: Information seeking expressions of users (1984) 9.91 
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  4. Derr, R.L.: ¬A conceptual analysis of information need (1983) 9.91 
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  5. Derr, R.L.: ¬A classification of questions in information retrieval by conceptual presupposition (1982) 9.91 
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