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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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ISI launches Discovery Agent (1998)
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Griswold, S.D.: Unleashing agents : the first wave of agent-enabled products hit the market (1996)
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Blank, I.; Rokach, L.; Shani, G.: Leveraging metadata to recommend keywords for academic papers (2016)
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Wilkinson, D.; Thelwall, M.: Trending Twitter topics in English : an international comparison (2012)
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