1. J. B. Suck, H. Rudin, H. J. Guntherodt, and H. Beck, J. Non-Cryst. Solids 61 & 62, 295 (1984).
2. J. B. Suck, in Dynamics of Disordered Materials, edited by D. Richter, A. J. Dianouse, W. Retry, and J. Teixeira, Berlin, 1989.
3. G. F. Syrykh, A. P. Zhernov, and N. A. Chernoplekov, Fiz. Tverd. Tela (Leningrad) 32, 2332 (1990) [Sov. Phys. Solid State 32, 1354 (1990)].
4. F. G. Syrykh, A. P. Zhernov, and N. A. Chernoplekov, Zh. Éksp. Teor. Fiz. 100, 982 (1991) [Sov. Phys. JETP 73, 542 (1991)].
5. G. F. Syrykh, A. P. Zhernov, and M. N. Khlopkin, Zh. Éksp. Teor. Fiz. 102, 1717 (1992) [Sov. Phys. JETP 75, 929 (1992)]; G. F. Syrykh, A. P. Zhernov, M. N. Khlopkin, and A. V. Suetin, J. Non-Cryst. Solids 181, 244 (1995).