1. European Community Regulation, Art. 2 Buchstabe w EG-VO.
2. Age assessment of ivory by analysis of C14 and Sr90 whether there is an antique on hand;Schmied;Forensic Sci. Int.,2011
3. http://www.bfn.de/0305_vollzugshinweise.html, August 16, 2011.
4. http://www.cites.org, August 16, 2011.
5. M.J. Brunnermeier, S.A.K. Schmied, M. Müller-Boge, R. Schupfner, Dating of ivory from 20th century by determination of C14 by the direct absorption method, Appl. Radiat. Isotopes, in press.