1. Liang, W.Y. (1991) in J.L. Beeby (ed.)Condensed Systems of Low Dimensionality, NATO-ASI Series, Ser. B 253, Plenum, New York, p. 677.
2. Rouxel, J. (1980) Physica
B99, 3.
3. Winn, D.A., Schemilt, J.M., and Steele, B.C.H. (1976) Mat. Res. Bull.
11, 559.
4. Basu, S. and Worrell, W.L. (1979) in P. Vashishta, J.N. Mundy, and G.K. Shenoy (eds.) Fast Ion Transport in Solids, North-Holland, Amsterdam, p. 149.
5. Samaras, I., Saikh, S.I., Julien, C., and Balkanski, M. (1989) Mater. Sci. Eng. B
3, 209.