1.
Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1990.
German | 29 DE | Available |
2.
St. Paul [Minnesota] : Thomson West, 2003.
German | G 870 PAT 2003-2004 | Available |
3.
[Place of publication not identified] : [publisher not identified], 1985.
Finnish | 13 US | Available |