1. V.A.Teplov, V.A. Pavlov and K.A. Malyshev, Fiz. Metal. Metalloved., 1969, vol. 27, n° 2, p. 339.
2. I.A. Arbuzova, V.S. Gavrilyuk and L.G. Khandros, Fiz. Metal. Metalloved., 1969, vol. 27, no 6, p. 1126.
3. K. Sugimoto, T. Mori, K. Otsuka and K. Shimizu, Scripta Met., 1974, vol. 8, p. 1341.
4. R.R. Hasiguti and K. Iwasaki, J1. Appl. Phys., 1968, vol. 39, p. 2182.
5. N.G. Pace and G.A. Saunders, Phil. Mag., 1970, vol. 22, no 175, p. 73.