1. M. Matsuoka, Jpn. J. Appl. Phys. 10 (1971) 736.
2. L.M. Levinson, H.R. Philipp, Ceram. Bull., 65 (1986) 639.
3. A.J. Moulson, J.M. Herbert, Electroceramics. Chapman and Hall, New York, 1990, pp. 123, 135.
4. K. Maeda, T. Miyoshi, Y. Takeda, K. Nakamura, S. Ogihara, M. Ura, Advances, Ceramics, vol 7 in: M.F. Yan, A.H. Heur (Eds.), American Ceramic Society, Columbus OH, 1983, p. 260.
5. G.J. Wong, J. Appl. Phys. 46 (1975) 1654.