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Bronson, R.J.: More NLM proximity searching hints (1996)
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Ojala, M.: Who's hosting this search? (1995)
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Smith, A.G.: Search features of digital libraries (2000)
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Bronson, R.J.: NLM's new proximity searching (1996)
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McJunkin, M.C.: Precision and recall in title keyword searching (1995)
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