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Bookstein, A.; Swanson, D.R.: Probabilistic models for automatic indexing (1974)
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- Journal of the American Society for Information Science. 25(1974), S.312-318
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Bookstein, A.; Klein, S.T.; Raita, T.: Clumping properties of content-bearing words (1998)
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- Journal of the American Society for Information Science. 49(1998) no.2, S.102-114