1. Zheludev, I.S.: Solid State Physics 29, 315–359, Ehrenreich, H., Seitz, F., Turnbull, D. (eds.), New York: Academic Press, 1974.
2. Abrahams, S.C.: Anomalous Scattering, Ramaseshan, S., Abrahams, S.C. (eds.), Intl. Union of Cryst., 1975, 199–221.
3. Landolt-Börnstein, New Series, Vol. III/9: Ferro-and Antiferroelectric Substances (Supplement and Extension to Vol. III/3), Berlin: Springer, 1975.
4. International Electrotechnical Commission Publ. 483, Guide to Dynamic Measurements of Piezoelectric Ceramics with High Electromechanical Coupling. Geneva, Switz.: Bureau Central de la Comm. Electrotech. Internationale, 1976.
5. IEEE Standard on Piezoelectricity, Std. 176. IEEE, 1978.