1. London, F.: Superfluids I. New York: Dover Publications 1960.
2. Pippard, A. B.: Proc. Cambridge Phil. Soc.47, 617 (1951).
3. Gorkov, L. P.: Soviet Phys. J.E.T.P.9, 1364 (1960);10, 593 (1960);10, 998 (1960).
4. Ginzburg, V. L., undL. D. Landau: J.E.T.P. (U.S.S.R.)20, 1064 (1950).
5. Abrikosov, A. A.: J. Phys. Chem. Solids2, 199 (1957).