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Lucas, W.; Topi, H.: Form and function : the impact of query term and operator usage on Web search results (2002)
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- Journal of the American Society for Information Science and technology. 53(2002) no.2, S.95-108
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Topi, H.; Lucas, W.: Mix and match : combining terms and operators for successful Web searches (2005)
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- Information processing and management. 41(2005) no.4, S.801-817