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Frants, V.I.; Kamenoff, N.I.; Shapiro, J.: ¬One approach to classification of users and automatic clustering of documents (1993)
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Hagedorn, K.: OAIster: a "no dead ends" OAI service provider (2003)
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Micco, M.; Popp, R.: Improving library subject access (ILSA) : a theory of clustering based in classification (1994)
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Golub, K.: Automatic subject indexing of text (2019)
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