1. WCO: Global congress addresses international counterfeits threat immediate action required to combat threat to finance/health. . Accessed 14 Nov 2005
http://www.wcoomd.org/en/media/newsroom/2005/november
2. WCO: Counterfeiting and piracy endangers global economic recovery, say global congress leaders. . Accessed 3 Dec 2009
http://www.wipo.int/pressroom/en/articles/2009/article_0054.html
3. Haist T, Tiziani HJ: Optical detection of random features for high security applications. Optic. Comm 1998, 147(1–3):173-179.
4. Suh GE, Devadas S: Physical unclonable functions for device authentication and secret key generation. In Proceedings of the 44th Annual Design Automation Conference. ACM, San Diego; 2007:9-14.
5. Gaubatz MD, Simske SJ, Gibson S: Distortion metrics for predicting authentication functionality of printed security deterrents. In 16th IEEE International Conference on Image Processing (ICIP), 2009. Cairo, IEEE, Piscataway; 2009:1489-1492.