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Spink, A.; Jansen, B.J.; Blakely, C.; Koshman, S.: ¬A study of results overlap and uniqueness among major Web search engines (2006)
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Hock, R.: Search engines (2009)
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Peterson, R.E.: Eight Internet search engines compared (1996)
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Milonas, E.: ¬The use of facets in Web search engines
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Collins, B.R.: Webwatch (1997)
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