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McJunkin, M.C.: Precision and recall in title keyword searching (1995)
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Morton, D.: Getting next to proximity operators (1993)
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Keen, E.M.: Some aspects of proximity searching in text retrieval systems (1992)
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Bronson, R.J.: More NLM proximity searching hints (1996)
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Bronson, R.J.: NLM's new proximity searching (1996)
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