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Keen, E.M.: ¬The Aberystwyth index languages tests (1973)
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Keen, E.M.: Prospects for classification suggested by evaluation tests (1976)
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Keen, E.M.: On the generation and searching of entries in printed subject indexes (1977)
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Keen, E.M.: Presenting results of experimental retrieval comparisons (1992)
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Keen, E.M.: Some aspects of proximity searching in text retrieval systems (1992)
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Fagan, J.L.: ¬The effectiveness of a nonsyntactic approach to automatic phrase indexing for document retrieval (1989)
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Fidel, R.; Efthimiadis, E.N.: Terminological knowledge structure for intermediary expert systems (1995)
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Frohmann, B.: Rules of indexing : a critique of mentalism in information retrieval theory (1990)
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