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Kay, M.; Sparck Jones, K.: Automated language processing (1971)
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Walker, D.E.: Automated language processing (1973)
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Damerau, F.J.: Automated language processing (1976)
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Robertson, S.E.; Sparck Jones, K.: Relevance weighting of search terms (1976)
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Montgomery, C.A.: Linguistics and information science (1972)
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