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