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Griffiths, A.; Robinson, L.A.; Willett, P.: Hierarchic agglomerative clustering methods for automatic document classification (1984)
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Willett, P.: Recent trends in hierarchic document clustering : a critical review (1988)
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Griffiths, A.; Luckhurst, H.C.; Willett, P.: Using interdocument similarity information in document retrieval systems (1986)
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Perry, R.; Willett, P.: ¬A revies of the use of inverted files for best match searching in information retrieval systems (1983)
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Wade, S.J.; Willett, P.; Bawden, D.: SIBRIS : the Sandwich Interactive Browsing and Ranking Information System (1989)
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