1.
2.
3.
4.
5.
[Place of publication not identified] : [publisher not identified], 1977.
Italian | 20 IT |
6.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1996.
German | 29 DE |
7.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1983.
German | 29 DE |
8.
9.