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Mendelsohn, J.: Perspectives on quality of reference service in an academic library : a qualitative study (1997)
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Lavin, M.R.: Improving the quality of business reference service (1995)
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Shachaf, P.; Oltmann, S.M.; Horowitz, S.M.: Service equality in virtual reference (2008)
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Whitson, W.L.: Differentiated service : a new reference model (1995)
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Biddiscombe, R.: CD-ROM and the reference librarian : the end of innocence (1992)
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