1. Samara, G. A., In Advances in High Pressure Research, Vol. 3, ed. R. S. Bradley. Academic Press, 1969, p. 155.
2. Samara, G. A., Ferroelectrics, 1991, 117, 347.
3. Sun, Y. et al., Mat. Lett., 1986, 4(8,9), 329.
4. Steiner, O., in preparation.
5. Robels, U. and Arlt, G., J. Appl. Phys., 1993, 73, 3454.