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Stock, M.; Stock, W.G.: Intellectual property information : A comparative analysis of main information providers (2006)
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Su, F.P.; Lai, K.K.; Sharma, R.R.K.; Kuo, T.H.: Patent priority network : linking patent portfolio to strategic goals (2009)
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Rademaker, C.A.: ¬The classification of ornamental designs in the United States Patent Classification System (2000)
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Leydesdorff, L.: Patent classifications as indicators of intellectual organization (2008)
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Special issue : knowledge acquisition representation and processing 1995 (1996)
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