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Bishop, B.W.: Location-based questions and local knowledge (2011)
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Pomerantz, J.: ¬A linguistic analysis of question taxonomies (2005)
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Nofsinger, M.M.; Bosch, A.W.: Roles of the head of reference : from the 1990s to the 21st century (1994)
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Pomerantz, J.: ¬A conceptual framework and open research questions for chat-based reference service (2005)
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Cloughley, K.: Digital reference services : how do the library-based services compare with the expert services? (2004)
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