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Schweikhardt, F.: Some thoughts on hybrid systems especially for patent documentation (1989)
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Rozov, B.: About patent classification (1993)
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Gersenovic, M.: ¬The ICD family of classifications (1995)
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Ohly, P.: Ingetraut Dahlberg (1927-2017) (2020)
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Pagell, R.A.; Weaver, P.J.S.: NAICS: NAFTA's industrial classification system (1997)
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