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Kimmel, S.: WWW search tools in reference services (1997)
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Zorn, P.: Advanced web searching : tricks of the trade (1996)
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Feldman, S.: Web search services in 1998 : trends and challenges (1998)
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Edwards, D.H.: Evaluating Internet search tools : a librarian's guide (1997)
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Sherman, C.; Price, G.: ¬The invisible Web : uncovering sources search engines can't see (2004)
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