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Porter, M.F.: ¬An algorithm for suffix stripping (1980)
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Fagan, J.L.: ¬The effectiveness of a nonsyntactic approach to automatic phrase indexing for document retrieval (1989)
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Salton, G.: Automatic processing of foreign language documents (1985)
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Needham, R.M.; Sparck Jones, K.: Keywords and clumps (1985)
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