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Lucas, W.; Topi, H.: Learning and training to search (2005)
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Topi, H.; Lucas, W.: Searching the Web : operator assistance required (2005)
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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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Topi, H.; Lucas, W.: Mix and match : combining terms and operators for successful Web searches (2005)
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