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Craven, T.C.: Adapting of string indexing systems for retrieval using proximity operators (1988)
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Sanderson, M.; Lawrie, D.: Building, testing, and applying concept hierarchies (2000)
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Dolin, R.; Agrawal, D.; El Abbadi, A.; Pearlman, J.: Using automated classification for summarizing and selecting heterogeneous information sources (1998)
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Pirkola, A.; Jarvelin, K.: ¬The effect of anaphor and ellipsis resolution on proximity searching in a text database (1995)
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Wu, Y.-f.B.; Li, Q.; Bot, R.S.; Chen, X.: Finding nuggets in documents : a machine learning approach (2006)
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