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  1. Leighton, H.V.: Performance of four World Wide Web (WWW) index services : Infoseek, Lycos, WebCrawler and WWWWorm (1995) 10.60 
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  2. Leighton, H.V.; Srivastava, J.: First 20 precision among World Wide Web search services (search engines) (1999) 10.60 
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