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