1. Uchino K (2000) Ferroelectric devices. Marcel Decker, New York
2. Hayashi K, Ando A, Hisaki T, Yoshikawa Y, Kimura M (2002) US Patent US6440324, 27 Aug 2002
3. Bamiere F, Benkert K, Denneler S, Radanielina M, Schuh C (2007) World Patent WO2007/074107, 5 July 2007
4. Jaffe B, Cook WR, Jaffe H (1971) Piezoelectric ceramics. Academic Press, London, pp 148–158
5. Nielsen ER, Ringaard E, Kosec M (2002) J Eur Ceram Soc 22:1847