1. M. Demartin Maeder and D. Damjanovic, inPiezoelectric Materials in Devices, edited by N. Setter (EPFL, Lausanne, 2002), p. 389.
2. B. Jaffe, W. R. Cook, Jr., and H. Jaffe,Piezoelectric Ceramics(Academic, New York, 1971), p. 135.
3. F. Jona and G. Shirane,Ferroelectric Crystals(Dover, New York, 1993), p. 108.
4. Y. Zu,Ferroelectric Materials and their Applications(North-Holland, Amsterdam, 1991), p. 101.
5. Lead-free piezoceramics