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Notess, G.R.: Search engine relevance : the never-ending quest (2000)
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Peterson, R.E.: Eight Internet search engines compared (1996)
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Bekavac, B.: Suchverfahren und Suchdienste des World Wide Web (1996)
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Röscheisen, E.: Fin de such (2001)
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Conhaim, W.W.: Search tools (1996)
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