1. Coffey, H.T.: Cryogenics7, 3 (1967)
2. Musatenko, A.Yu., Mukovskii, Ya.M., Nigmatullin, A.S., Komarov, A.O., Kotov, I.M.: Problemy vysokotemperaturnoy sverkhprovodimosti. (in Russian: HighT c Superconductivity Problems. Proceedings of the National Meeting on High-Tc Superconductivity, Sverdlovsk, July 7?10, 1987), Vol. 1, p. 24
3. Bush, A.A., Gladyshev, I.V., Gordeev, S.N., Zhukov, A.A.: Sverkhprovodimost Phys Chim Tekhnol 2, 78 (1988)
4. Landau, L.D., Lifshits, E.M.: Elektrodinamika sploshnykh sred. p. 45. Moscow: Nauka 1982
5. Kupfer, H., Apfelstedt, I., Flukiger, R., Keller, C., Meier-Hirmer, R., Runtsch, B., Turowski, A., Wiech, U., Wolf, T.: Cryogenics28, 650 (1988)