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  • × year_i:[1980 TO 1990}
  1. Schiffels, R.: Kategorien der Internationalen Patentklassifikation, insbesondere hinsichtlich der Einordnung von Produkten (1982) 8.65 
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  2. Gesell, J.: Neuauflage der Internationalen Patentklassifikation : incompatibility issues of library classification systems and subject headings in subject cataloguing (1986) 8.65 
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  3. Vries, S. de: Points of interest concerning the new IPC (1989) 8.65 
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