1. Forrest, W. J., Moneti, A., Woodward, C. E., Pipher, J. L. and Hoffman, A. 1985 PASP 97, 183
2. Kimata, M, Denda, M., Yutani, N., Iwade, S., Tsubouchi, N. 1987 IEEE Journal of Solid-State Circuits, sc-22, No. 6
3. Konuma, K., Asano, Y. and Hirose, K. 1995 Physical Review, in press
4. Tsumuraya, F. 1994 Ph. D. thesis
5. Ueno, M., Ito, M., Kasaba, Y. and Sato, S. 1992 Proc. of SPIE, conf. vol 1762, p. 423