1. Maekawa, T., Hayashi, Y., Hayashi, H., Inagaki, M., Yamada, N. and Urabe, T. 1992.S.I.D. 92 Digest55
2. Okita, Y., Yamada, T., Nakatani, N., Ohima, S., Marushita, Y., Arioka, T. and Nakakado, T. 1991.S.I.D. 90 Digest411
3. Haas, G., Fritsch, M. G., Wöhler, H. F. and Mlynski, D. A. 1990.S.I.D. 90 Digest102
4. Lien, A. Proc. 10th Int. Display Research Conference. pp.248