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Ojala, M.: Filtered information and intelligent agent software (1995)
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Information-filtering software for the Internet from Verity (1996)
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Norman, O.G.: Marketing libraries and information services. : an annotated guide to recent trends and development (1989)
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Raina, R.: Information marketing (1998)
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Shepherd, M.; Duffy, J.F.J.; Watters, C.; Gugle, N.: ¬The role of user profiles for news filtering (2001)
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