1. H. K. Onnes, Leiden Commun. 119b, 122b (1911).
2. G. Rickayzen, Theory of Superconductivity, Wiley-Interscience, New York (1965).
3. A. C. Rose-Innes and E. H. Rhoderick, Introduction to Superconductivity, Pergamon Press, Oxford (1969).
4. M. Tinkham, Introduction to Superconductivity, McGraw-Hill, New York (1975).
5. J. R. Schrieffer, Theory of Superconductivity, W. A. Benjamin, New York (1964).