1. B. N. Goshchitskii et al., Sov. Sci. Rev., Sect. A 8, 519 (1987).
2. S. A. Aleksandrov et al., Irradiation Action on Physical Properties of Perspective Superconductors (Energoatomizdat, Moscow, 1989) [in Russian].
3. S. A. Davydov et al., Pis’ma Zh. Eksp. Teor. Fiz. 47, 193 (1988) [JETP Lett. 47, 234 (1988)].
4. B. A. Aleksashin et al., Zh. Eksp. Teor. Fiz. 95, 678 (1989) [Sov. Phys. JETP 68, 382 (1989)].
5. M. V. Sadovskii, Phys. Rep. 282, 225 (1997).