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Bartenbach, B.: Compendex Plus (1995)
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Regazzi, J.J.: User driven : the evolution of the Ei Reference Desk (1992)
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O'Leary, M.: STN Easy solves sci-tech search woes : Web-based service opens powerful searching to sci-tech end users (1997)
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Kostoff, R.N.; Eberhart, H.J.; Toothman, D.R.: Database tomography for information retrieval (1997)
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