1.
2.
3.
4.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1988.
German | 29 DE |
5.
6.
7.
[Place of publication not identified] : [publisher not identified], 1989.
Portuguese | 29 DE |
8.
[Place of publication not identified] : [publisher not identified], 1989.
Portuguese | 29 DE |
9.
[Place of publication not identified] : [publisher not identified], 1987.
German | 29 DE |