1.
2.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1990.
German | 29 DE |
3.
[Place of publication not identified] : [publisher not identified], 1983.
French | 48 FR |
4.
[Place of publication not identified] : [publisher not identified], 1976.
German | 48 FR |
5.
6.
7.
8.
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10.