1.
München : Beck, 1998.
10. Aufl.
German | N 40 REH.U | Available |
2.
Geneva, Switzerland : World Intellectual Property Organization, 1999.
English | E 3330 OMPI.A(A) | Available |
3.
Tübingen : Mohr Siebeck, 1997.
German | N 742 SCH.U | Available |