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Vidmar, D.J.: Darwin on the Web : the evolution of search tools (1999)
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Dasgupta, S.K.: Search engines : tooles for exploring the Internet (1998)
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Chang, C.-H.; Hsu, C.-C.: Customizable multi-engine search tool with clustering (1997)
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Jascó, P.: Péter's picks and pans : CiteBaseSearch, Institute of Physics Archive, and Google's index to scholarly archive (2004)
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