1. London, F.: Superfluids, Vol.1. Wiley, New York (1950)
2. London, F., London, H.: Proc. Roy. Soc. A149, 71 (1935)
3. London, F.: Physica 3, 458 (1936)
4. Tinkham, M.: Introduction to Superconductivity. McGraw Hill, New York (1966)
5. Meissner, W., Ochsenfeld, R.: Naturwiss. 21, 787 (1933)