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Sherman, C.; Price, G.: ¬The invisible Web : uncovering information sources search engines can't see (2001)
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Sherman, C.; Price, G.: ¬The invisible Web : uncovering sources search engines can't see (2004)
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Lewandowski, D.; Mayr, P.: Exploring the academic invisible Web (2006)
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Joint, N.: ¬The one-stop shop search engine : a transformational library technology? ANTAEUS (2010)
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Gross, R.A.: ¬The incredible vanishing library (1995)
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