1. V. P. Silin,Zh. Eksp. Teor. Fiz. 35, 1243 (1958).
2. L. D. Landau,Zh. Eksp. Teor. Fiz. 30, 1058 (1956);32, 49 (1957).
3. V. P. Silin,Zh. Eksp. Teor. Fiz. 33, 495 (1957); see also V. P. Silin,Fiz. Met. and Metalloved. 29, 681 (1970).
4. S. Schultz and G. Dunifer,Phys. Rev. Lett. 18, 283 (1967).
5. G. Dunifer, S. Schultz, and P. H. Schmidt,J. Appl. Phys. 39, 397 (1968).