1. J. Vřešťál and J. Kučera:Trans. TMS-AIME, 1969, vol. 245, pp. 1891–95.
2. C. E. Birchenall:Trans. AIME, 1947, vol. 171, pp. 166–73.
3. I. M. Puzey and V. I. Gomankov:Fiz. Metal. Metalloved., 1967, vol. 23, pp. 636–41.
4. J. Kučera.Czech. J. Phys., 1961, vol. A11, p. 1.
5. J. Vřešťál and J. Kučera:Czech. J. Phys., 1969, vol. A19, pp. 660–63.