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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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Rademaker, C.A.: ¬The classification of ornamental designs in the United States Patent Classification System (2000)
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Elichirigoity, F.; Malone, C.K.: Measuring the new economy : industrial classification and open source software production (2005)
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Elichirigoity, F.; Knott Malone, C.: Representing the global economy : the North American Industry Classification System (2003)
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