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2. A. Lidiard, Ionic Conductivity [Russian translation], IL (1962).
3. R.W. Vest and N.M. Tallan, J. App.Phys.,32, No.2 (1965).
4. L.B. Khoroshavin and G.A. Sapeev, Ogneupory, No.6, 43 (1966).
5. D.N. Poluboyarinov et al., High-Alumina Ceramic Materials [in Russian], Stroiizdat (1960).