Search (3 results, page 1 of 1)
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author_ss:"Derr, R.L."
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year_i:[1980 TO 1990}
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theme_ss:"Informationsdienstleistungen"
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language_ss:"e"
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type_ss:"a"
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Derr, R.L.: Questions: definitions, structure, and classification (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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