Industrial Property : Monthly Review of the World Intellectual Property Organization (WIPO) and the United International Bureaux for the Protection of Intellectual Property (BIRPI) ; 10th year – No. 4, April 1971.
Industrial Property : Monthly Review of the World Intellectual Property Organization (WIPO) and the United International Bureaux for the Protection of Intellectual Property (BIRPI) ; 10th year – No. 4, April 1971.