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Bookstein, A.; Klein, S.T.; Raita, T.: Clumping properties of content-bearing words (1998)
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Bookstein, A.; Raita, T.: Discovering term occurence structure in text (2001)
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Bookstein, A.; Kulyukin, V.; Raita, T.; Nicholson, J.: Adapting measures of clumping strength to assess term-term similarity (2003)
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