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Stevens, N.D.: Evaluating reference books in theory and practice (1986)
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Stevens, N.D.: Public libraries and the Internet / NREN : new challenges, new opportunities (1992)
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Stevens, N.D.: First-hand reflections on the realities of reference service (1995)
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Stevens, N.D.: ¬The importance of the verb in the reference question (1988)
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Debole, F.; Sebastiani, F.: ¬An analysis of the relative hardness of Reuters-21578 subsets (2005)
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López-Herrera, A.G.; Herrera-Viedma, E.; Herrera, F.: ¬A study of the use of multi-objective evolutionary algorithms to learn Boolean queries : a comparative study (2009)
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Raghavan, V.V.; Jung, G.S.; Bollmann, P.: ¬A critical investigation of recall and precision as measures of retrieval system performance (1989)
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DeHart, F.E.; Glazier, J.: Computer searching on PRECIS : an exploration of measuring comparative retrieval effectiveness (1984)
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