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Rademaker, C.A.: ¬The classification of ornamental designs in the United States Patent Classification System (2000)
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Yan, B.; Luo, J.: Measuring technological distance for patent mapping (2017)
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Thompson, N.J.: Intellectual property materials online/CD-ROM : what and where (1992)
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Dickens, D.T.: ¬The ECLA classification system (1994)
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Rampelmann, J.: Classification tools at the EPO (1996)
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