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Janes, J.; Hill, C.; Rolfe, A.: Ask-an-expert services analysis (2001)
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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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Chowdhury, G.G.: Digital libraries and reference services : present and future (2002)
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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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Lochore, S.: How good are the free digital reference services? : a comparison of library-based and expert services (2004)
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