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Childers, T.A.: California's reference crisis (1994)
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Westbrook, L.: Unanswerable questions at the IPL : user expectations of e-mail reference (2009)
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Bishop, B.W.: Location-based questions and local knowledge (2011)
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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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Kenney, A.R.; McGovern, N.Y.; Martinez, I.T.; Heidig, L.J.: Google meets eBay : what academic librarians can learn from alternative information providers (2003)
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