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Li, J.; Wu, G.: Characteristics of reference transactions : challenges to librarian's roles (1998)
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Whitson, W.L.: Differentiated service : a new reference model (1995)
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Hixson, C.R.: CD-ROM and the undergraduate : reference and instruction at risk (1993)
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Mardikian, J.; Kesselman, M.: Beyond the desk : enhanced reference staffing for the electronic library (1995)
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Tumlin, M.D.: Point-of-use instruction on CD-ROM : how much is too much? (1993)
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