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Heidenreich, F.: Know your search engine : a comparison of 6 popular Web search engines (1997)
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Thelwall, M.; Sud, P.: ¬A comparison of methods for collecting web citation data for academic organizations (2011)
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Raeder, A.: Cataloguing the Web (1995)
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Webber, S.: Search engines and news services : developments on the Internet (1998)
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