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Kemp, A. de: Information provision : a publisher's point of view in changing times and with new technologies (1993)
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Xie, I.; Matusiak, K.M.: Discover digital libraries : theory and practice (2016)
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Yi, H.: Library instruction goes online : an inevitable trend (2005)
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Enser, P.: ¬The evolution of visual information retrieval (2009)
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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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