1. Ph.D. Thesis;Law H. H.,1994
2. Electrically controlled elasticity utilizing piezoelectric coupling
3. Okubo, T., Kodama, H., Kimura, K., Yamamoto, K., Fukada, E. and Date, M. Sound-isolation and vibration-isolating efficiency piezoelectric materials connected to negative capacitance circuits. Proc. 17th International Congress on Acoustics, Rome.
4. Noise shielding system utilizing a thin piezoelectric membrane and elasticity control