1. J. Jang, J.I. Ryu, S.Y. Yoon, and K.H. Lee, Vacuum 51, 769 (1998).
2. J.I. Ryu, Y.J. Choi, I.K. Woo, B.C. Lim, and J. Jang, J. Non-Crystalline Solids 266–269, 1310 (2000).
3. K. Ono, T. Suzuki, H. Sakuta, K. Onisawa, M. Hiroshima, T. Sasaki, M. Tsumura, and N. Konishi, IEICE Trans. Electron E79-C, 1097 (1996).
4. K. Ono, H. Sakuta, T. Suzuki, N. Konishi, M. Hiroshima, K. Onisawa, and M. Tsumura, Proc. Asia Display (Tokyo: Institute of Television Engineers of Japan, 1995), pp. 693–696.
5. Y. Ugai, T. Yukawa, K. Amano, and S. Aoki, Jpn. J. Appl. Phys. 35, L1027 (1996).