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Vaughan, L.; Thelwall, M.: Search engine coverage bias : evidence and possible causes (2004)
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- Information processing and management. 40(2004) no.4, S.693-708
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Thelwall, M.; Vaughan, L.: New versions of PageRank employing alternative Web document models (2004)
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- Aslib proceedings. 56(2004) no.1, S.24-33