1. Personal communication.
2. 50 Years of X-Ray Differaction Reprinted in pdf format for the IUCr XVIII Congress,1999
3. Epson introduces revolutionary image authentication system for Epson digital cameras;Business Wire,1999
4. Inventing the Web;Abbate;Proc. of the IEEE,1999
5. Informed watermarking by means of orthogonal and quasi-orthogonal dirty paper coding;Abrardo;IEEE Trans. on signal Processing,2005