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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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Keen, M.: Query reformulation in ranked output interaction (1994)
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Bawden, D.; Robinson, L.: Information and the gaining of understanding (2015)
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Guenther, R.S.: ¬The USMARC Format for Classification Data : development and implementation (1992)
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