1. H. Bernas, J. P. Burger, G. Deutscher, C. Valette andS. J. Williamson:Phys. Lett. A,24, 721 (1967);C. Valette: Thesis, Orsay (1971).
2. See for instance,V. I. Ginzburg andL. D. Landau:On the theory of superconductivity, inCollected Papers of L. D. Landau, edited byD. Ter Haar (Pergamon Press, London, 1965), p. 217.
3. Orsay Group on Superconductivity: Contribution toQuantum Fluids, presented byP. G. de Gennes, edited byD. F. Brewer (North-Holland, Amsterdam, 1966).
4. L. Gonzalez-Mestres andD. Perret-Gallix: preprint LAPP-EXP-84-05, TH-112 (1984).
5. J. Feder, S. R. Kiser andF. Rothwarf:Phys. Rev. Lett.,17, 87 (1966);J. P. Burger, J. Feder, S. R. Kiser, F. Rotwarf andC. Valette:Proceedings of the X International Conference on Low Temperature Physics, Vol.2B (Moscow, 1966), p. 352.