1. — J.Bardeen, L.N. Cooper, and J.R.Schrieffer, Phys.Rev. 108, 1175(1957)
2. — See the review: C.P. Enz, Helv. Phys. Acta 61, 741(1988)
3. — N.N. Bogoliubov, Zh. Eksperim. Teor.Fiz. 34, 58(1958)
4. [English Trans 1.: Sov.Phys. — JETP 7, 41(1958)] Usp.Fiz. Nauk SSSR 67, 549(1959) [English Trans1.: Sov.Phys. — Usp. 2, 236(1959)] N.N. Bogoliubov, V.V. Tolmachev, and D.V. Shirkov, A New Method in the Theory of Superconductivity(Academy of Sciences of the USSR Press, Moscow, 1958) [English Transl.: Consultants Bureau, New York, 1959]
5. ??? D.H. Kobe, Phys.Rev. 140, A825(1965);