TY  - BOOK
ED  - World Intellectual Property Organisation (WIPO) <Geneva>
TI  - International Patent Classification: Core Level ; Sections A and B ; Sections C and D ; Sections E and F ; Sections G and H ; Guide to the IPC
T2  - WIPO Publication
PY  - 2005///
CY  - Geneva, 
KW  - Internationale Patentklassifikation
ER  -