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Sherman, C.; Price, G.: ¬The invisible Web : uncovering information sources search engines can't see (2001)
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Mansourian, I.: Web search efficacy : definition and implementation (2008)
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Fu, T.; Abbasi, A.; Chen, H.: ¬A focused crawler for Dark Web forums (2010)
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Choo, C.W.; Detlor, B.; Turnbull, D.: Information seeking on the Web : an integrated model of browsing and searching (1999)
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