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Geiß, D.: Recherchetechniken in Patentinformationsnetzen, dargestellt am Beispiel des CD-ROM Kommunikationsnetzes des Informationszentrums Technik und Patente der Universitätsbibliothek Dortmund (1996)
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Herbig, E.: ¬Die Internationale Patentklassifikation (1978)
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Adams, A.: Using the International Patent Classification in an online environment (2000)
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Blake, P.: ¬The arrival of free patent information : Internet provision of patent information for free is affecting vendors (1998)
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