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Heidenreich, F.: Know your search engine : a comparison of 6 popular Web search engines (1997)
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Callery, A.; Tracy-Proulx, D.: Yahoo! : Cataloging the Web (1997)
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Tunender, H.; Ervin, J.: How to succeed in promoting your Web site : the impact of search engine registration on retrieval of a World Wide Web site (1998)
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Lambert, S.: Internet basics : your online access to the global electronic super highway (1993)
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Collins, B.R.: Webwatch (1997)
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