1.
2.
Müchen [Germany] : Verlag Dokumentation, 1975.
German | 5 DE |
3.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1975.
German | 28 DE |
4.
5.
6.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1973.
German | 28 DE |
7.
8.
9.