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Schiffels, R.: Kategorien der Internationalen Patentklassifikation, insbesondere hinsichtlich der Einordnung von Produkten (1982)
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Campbell, G.: Chronotope and classification : how space-time configurations affect the gathering of industrial statistical data (2003)
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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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