Semiconductor Physics, Quantum Electronics and Optoelectronics, 4 (1) P. 070-073 (2001).


References

1. G. Antes, Document having an optical-diffraction authenticating element, Swiss patent No. 5820/82, 1993.
2. J.-F. Moser, Document protection by optically variable graphics (Kinegram), Optical Document Security, R. L. van Renesse Ed., Chap. 9, pp. 169-185, Artech House, Boston, 1994.
3. R.A. Lee, The Pixelgram - an application of electron bean lithography for the security printing industry // Proc. SPIE 1509, pp. 48-54, 1991.
4. R.A. Lee, Security diffraction grating with special optical effects, Australian patent application No. PL1316, 1993.