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Crawford, G.A.: ¬A conjoint analysis of reference services in academic libraries (1994)
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Abels, E.G.: ¬The e-mail reference interview (1996)
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Liebscher, P.; Abels, E.G.; Denman, D.W.: Factors that influence the use of electronic networks by science and engineering faculty at small institutions : Part II: Preliminary use indicators (1997)
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Staley, L.: E-mail reference : experiences at City University (1998)
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Park, J.-r.; Li, G.; Burger, A.: Opening and closing rituals of the virtual reference service of the Internet Public Library (2010)
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