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Rampelmann, J.: Classification tools at the EPO (1996)
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White, M.J.: Patents and patent searching (2009)
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Liu, D.-R.; Shih, M.-J.: Hybrid-patent classification based on patent-network analysis (2011)
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Faucompre, P.; Quoniam, L.; Dou, H.: ¬The function-application relation through a link between classification and indexing (1997)
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Stock, M.; Stock, W.G.: Intellectual property information : A comparative analysis of main information providers (2006)
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