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  1. Bresemann, H.-J.; Zimdars, J.; Skalski, D.: Wie finde ich Normen, Patente, Reports : ein Wegweiser zu technisch-naturwissenschaftlicher Spezialliteratur (1995) 6.68
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  2. Internationale Patentklassifikation (1974 ff.) 6.68
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  3. Jaffe, A.B.; Trajtenberg, M.: Patents, citations and innovations : a window on the knowledge economy (2002) 6.68
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  4. Schmitz, J.: Patentinformetrie : Analyse und Verdichtung von technischen Schutzrechtsinformationen (2010) 6.68
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  5. Internationale Patentklassifikation : Gesamtwerk (2001) 6.68
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