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Milstead, J.L.: Methodologies for subject analysis in bibliographic databases (1992)
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Asija, S.P.: Natural language interface without artifical intelligence (1989)
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Silvester, J.P.; Genuardi, M.T.; Klingbiel, P.H.: Machine-aided indexing at NASA (1994)
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Purcell, R.: Wanted: fully automated indexing (1991)
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Buchan, R.L.: Quality indexing with computer-aided lexicography (1992)
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