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O'Kane, K.C.: Generating hierarchical document indices from common denominators in large document collections (1996)
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Tiggelen, N. van: ¬Een landelijk systeem zou ideaal zijn : bibliotheken van Leerdam en Weert experimenteren met alternatieve plaatsing (1998)
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STN International launches STN Easy on World Wide Web (1997)
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Keen, M.: ¬The Okapi projects (1997)
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Berry, M.W.; Browne, M.: Understanding search engines : mathematical modeling and text retrieval (2005)
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