1.
2.
3.
4.
Bruxelles [Belgium] : Imprimerie Wellens, 1963.
Dutch | H 441 PRO |
5.
6.
Geneva [Switzerland] : International Bureau for the Protection of Industrial Property, 1975.
English | 10B OMPI |
7.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1974.
German | 29 DE |