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Morton, D.: Getting next to proximity operators (1993)
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Smith, A.G.: Search features of digital libraries (2000)
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Valas, G.: Comparison of some widespread CD-ROM information retrieval software packages (1994)
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Dalrymple, P.W.; Cox, R.: ¬An examination of the effects of non-Boolean enhancements to an information retrieval system (1992)
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Keen, E.M.: Some aspects of proximity searching in text retrieval systems (1992)
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