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Makulowich, J.S.: 1997; what's ahead? (1997)
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Bischopinck, Y. von; Ceyp, M.: Suchmaschinen-Marketing : Konzepte, Umsetzung und Controlling (2007)
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Cecchini, R.L.; Lorenzetti, C.M.; Maguitman, A.G.; Brignole, N.B.: Using genetic algorithms to evolve a population of topical queries (2008)
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Webber, S.: Search engines and news services : developments on the Internet (1998)
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Negm, E.; AbdelRahman, S.; Bahgat, R.: PREFCA: a portal retrieval engine based on formal concept analysis (2017)
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