1. Yu. F. Komnik, Physics of Metallic Films: Dimensional and Structural Effects (Atomizdat, Moscow, 1979) [in Russian].
2. D. Saint-James and P. G. de Gennes, Phys. Lett. 7, 306 (1963).
3. A. A. Abrikosov, Zh. Éksp. Teor. Fiz. 47, 720 (1964) [Sov. Phys. JETP 20, 480 (1964)].
4. R. S. Thompson and A. Baratoff, Phys. Rev. Lett. 15, 971 (1965).
5. E. A. Shapoval, Zh. Éksp. Teor. Fiz. 49, 930 (1965) [Sov. Phys. JETP 22, 647 (1965)].