1. V. A. Bokov, I. E. Mel’nikova, S. A. Kizhaev, et al., Fiz. Tverd. Tela (Leningrad) 7, 3695 (1965) [Sov. Phys. Solid State 7, 2993 (1965)].
2. T. Kimura, S. Kawamoto, I. Yamada, et al., Phys. Rev. B 67, 180401(R) (2003).
3. T. Kimura, T. Goto, H. Shintani, et al., Nature 426, 55 (2003).
4. A. R. Long, Adv. Phys. 31, 587 (1982).
5. S. L. Ginzburg, Irreversible Processes in Spin Glasses (Nauka, Moscow, 1989), p. 152 [in Russian].