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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.: Laboratory tests of manual systems (1981)
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Keen, E.M.: Using channels, topics, keywords and other metadata in an electronic alerting service (2000)
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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, E.M.; Hartley, R.J.: Phrase processing in text retrieval (1994)
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Keen, E.M.: Aspects of computer-based indexing languages (1991)
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Keen, E.M.: Designing and testing an interactive ranked retrieval system for professional searchers (1994)
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