1.
2.
[Place of publication not identified] : [publisher not identified], 1973.
French | 6A OMPI | Available |
3.
Geneva [Switzerland] : International Bureau for the Protection of Industrial Property, 1976.
English | 10B OMPI | Available |
4.
[Geneva, Switzerland] : [World Intellectual Property Organization], 1973.
English | 6B OMPI | Available |