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  1. Thelwall, M.: Web impact factors and search engine coverage (2000) 0.02 
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    Source
    Journal of documentation. 56(2000) no.2, S.185-189
  2. Mayr, P.; Tosques, F.: Webometrische Analysen mit Hilfe der Google Web APIs (2005) 0.02 
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    Source
    Information - Wissenschaft und Praxis. 56(2005) H.1, S.41-48

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