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Derr, R.L.: Questions: definitions, structure, and classification (1985)
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Jahoda, G.; Braunagel, J.S.: ¬The librarian and reference queries : a systematic approach (1980)
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Kuhlthau, C.C.: Developing a model of the library search process : cognitive and affective aspects (1988)
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Loosen, D.: Suchstrategien im bibliothekarischen Informationsdienst : Definitionen und Probleme sowie Entwicklung allgemeiner und beispielhafter Handlungsweisen (1988)
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