1. Handb. Phys., Vol. 20, Ed. Springer-Verlag, Berlin 1957 (p. 246),
2. in: Theory of Imperfect Crystalline Solids, International Atomic Energy Agency, Vienna 1971 (p. 339).
3. see [1] (p. 350).
4. in: Fast Ion Transport in Solids, Ed. North-Holland Publ. Co., Amsterdam 1973 (p. 373).
5. and , AERE Rep., to be published.