Lewinski, Silke von Intellectual Property and Competition Law, MPI for Intellectual Property, Competition and Tax Law, Max Planck Society;
http://www.wipo.int/edocs/mdocs/copyright/en/avp_im_03/avp_im_03_4d_rev.pdf (Any fulltext)
Lewinski, S. v., & Thum, D. (2003). Answers on Germany Relating to the Questionnaire to National Experts contained in the Appendix to the Study on Transfer of the Rights of Performers to Producers of Audiovisual Fixations, WIPO (Document AVP/IM/03/4D).