1. D. C. Dumitras, D. C. Dutu, C. Matei, A. Magureanu, M. Petrus, and C. Popa, J. Optoelectron. Adv. Mater. 9, 3655 (2007).
2. C. Kumar and N. Patel, Gases Technol. 1, 24 (2002).
3. L. R. Narasimhan, W. Goodman, C. Kumar, and N. Patel, in Proceedings of the National Academy of Sciences of the U.S.A. (2001), pp. 4617–4621.
4. D. C. Dumitras, D. C. Dutu, C. Matei, A. Magureanu, M. Petrus, C. Popa, and M. Patachia, Roman. Rep. Phys. 60, 593 (2008).
5. S. Cristescu, D. C. Dumitras, and D. C. Dutu, in Proceedings of SPIE 4070, Potenza, Lecce, Italy, 1999, pp. 182–193.