1.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1982.
German | 29 DE |
2.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1987.
German | 29 DE |
3.
4.
Buffalo, New York : The Patent and Trademark Office Society, 1980.
English | 47 US |
5.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1978.
German | 28 DE |