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Constructing, organizing, and visualizing collections of topically related Web resources[J] . Loren Terveen,Will Hill,Brian Amento.ACM Transactions on Computer-Human Interaction (TOCHI) . 1999 (1)
[2]
Focused crawling: a new approach to topic-specific Web resource discovery[J] . Soumen Chakrabarti,Martin van den Berg,Byron Dom.Computer Networks . 1999 (11)