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Derr, R.L.: Questions: definitions, structure, and classification (1985)
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Hsieh-Yee, I.: ¬The retrieval power of selected search engines : how well do they address general reference questions and subject questions? (1998)
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Sherman, C.: Reference resources on the Web (2000)
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Havener, W.M.: Answering ready reference questions : print versus online (1990)
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Campbell, S.; Parker, F.; Follender, S.I.: Information to hostile questions : more insights from speech act theory (1996)
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