1. A discussion of type I and type II superconductors, and of the Ginzburg-Landau (GL) equations, which provide a convenient framework for analyzing metastable states, can be found in P. G. de Gennes, Superconductivity of Metals and Alloys. New York: W. A. Benjamin, Inc. 1966, Chaps. 2, 3, 6 and 7.
2. Feder, J., Kiser, S. R., Rothwarf, F.: Phys. Rev. Letters17, 87 (1966).
3. Burger, J. P., Feder, J., Kiser, S. R., Rothwarf, F., Valette, C.: Proceedings of the Tenth International Conference on Low Temperature Physics. Ed.: M. P. Malkov. VINITI, Moscow 1967, vol. IIB, p. 352.
4. Smith, F. W., Cardona, M.: Phys. Letters24 A, 247 (1967).
5. ——: Solid State Commun.5, 345 (1967).