1. 1) H. Izui, K. Hamada, K. Ogawa, M. Taya and K. Inoue: Materials for smart systems II (Materials Research Society Symposium Proceedings 1997) pp.425-430.
2. 2) Y. Furuya: Proceedings of the International Symposium on Microsystems, Intelligent materials and robots, ed. by J. Tani and M. Esashi, (Tohoku University, Sendai, 1995) pp.313-318.
3. 3) W. Zheng, W. Jiansheng, X. Ke and T. Baoqui: Progress in Advanced Materials and Mechanics, ed. by W. Tzuchiang, T.W. Chou, (Peking University Press, Beijing, 1996) pp.350-355.
4. 4) V. Birman: International Journal of Mechanical Sciences 39 (1997) 1139-1149.
5. 5) M.-T. Ho, R.R. Chen, L.-C. Chu: Proceedings of Smart Structures and Materials, Vol3041, ed. by M.E. Regelbrugge, (SPIE, San Diego, 1997) pp.901-911.