1. Fast Ion Transport in Solids, Solid State Batteries and Devices, W. van Gool ed. North Holland Publ. Co, Amsterdam (1973).
2. C.P. Flynn, “Point Defects and Diffusion” Clarendon Press, Oxford (1972).
3. W.J. Pardee and G.D. Mahan, J. Sol. State Chem. 15, 310 (1975).
4. S.J. Allen and J.P. Remeika, Phys. Rev. Letters. 33, 1478 (1974).
5. B.A. Huberman and P.N. Sen, Phys. Rev. Letters 33., 1379 P.N. Sen and B.A. Huberman, Phys. Rev. Letters 34, 1059