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McCrea, R.: Evaluation of two library-based and one expert reference service on the Web (2004)
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Cushing, A.L.: "It's stuff that speaks to me" : exploring the characteristics of digital possessions (2013)
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Joint, N.: Virtual reference, Second Life and traditional library enquiry services : ANTAEUS (2008)
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Soergel, D.: Digital libraries and knowledge organization (2009)
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