1. Varandani, D., Narlikar, V.: Phys. Rev. B 50, 462–469 (1994)
2. Davydov, S., Kruchinin, S.P.: Physics C 235, 2611–2612 (1994)
3. Kruchinin, S.P., Yaremko, A.M.: Supercond. Sci. Technol. 11, 4 (1998)
4. Akhiezer, A.I., Pomeranchuk, I.Y.: On the interaction between conductivity electrons in ferromagnetics. Zh. Eksp. Teor. Fiz. 36, 819 (1959)
5. Akhiezer, A. I., Bar’yakhtar, V. G., Peletminskii, S. V.: Spin waves, p. 369. North-Holland, Amsterdam (1968)