1.
2.
3.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1978.
German | 28 DE |
4.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1977.
German | 28 DE |
5.
6.
7.
8.
9.
10.
[Place of publication not identified] : [publisher not identified], 1977.
German | 9 DE |