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Liu, D.-R.; Shih, M.-J.: Hybrid-patent classification based on patent-network analysis (2011)
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Wittmann, A.: Classifying and indexing of patent documents : a retired patent documentalist looks back (1994)
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Dickens, D.T.: ¬The ECLA classification system (1994)
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Stock, M.; Stock, W.G.: Intellectual property information : A comparative analysis of main information providers (2006)
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Kaiser, M.; Lieder, H.J.; Majcen, K.; Vallant, H.: New ways of sharing and using authority information : the LEAF project (2003)
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