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Barry, E.; Bedoya, J.K.; Groom, C.; Patterson, L.: Virtual reference in UK academic libraries : the virtual enquiry project 2008-2009 (2010)
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Lewis, K.M.; DeGroote, S.L.: Digital reference access points : an analysis of usage (2008)
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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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