1.
2.
Müchen [Germany] : Verlag Dokumentation, 1972.
German | 5 DE |
3.
4.
5.
6.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1973.
Danish | 28 DE |
7.
Berlin, Köln : Heymann, 1957.
German | N 63 SCH.S |
8.
9.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1975.
German | 28 DE |