W.-H. Chan, Z. Xu, Y. Zhang, T.F. Hung, H. Chen, J. Appl. Phys. 94, 4563 (2003)
R.L. Byer, C.B. Roundy, Ferroelectrics 3, 333 (1972)
W.-H. Chan, Haydn Chen, E.V. Colla, Appl. Phys. Lett. 82, 2314 (2003)
D. Berlincourt, IEEE Trans. Sonics Ultrason. SU-13, 116 (1966)
A. Amin, J. Electroceram. 8, 99 (2002)
T. Yang, P. Liu, Z. Xu, L. Zhang, X. Yao, Ferroelectrics 230, 181 (1999)
S. Bauer, B. Ploss, J. Appl. Phys. 68, 6361 (1990)