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Force, R.: Planning online reference services for the 90s (1994)
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Martin, M.S.: Is your library reference poor? : pt.2 (1996)
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Orgren, C.F.: Cooperative reference service (1994)
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Lewis, D.W.: Making academic reference service work (1994)
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Singh, D.K.; Singh, B.K.; Dubey, Y.P.: Expert systems and their application in library and information systems (1996)
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