1. G. Deutscher and P. de Gennes, in Superconductivity, R.D. Parks, ed., Marcel Dekker, New York (1969).
2. Orsay Group, in Quantum Fluids, D.F. Brewer, ed., North-Holland, Amsterdam (1966).
3. Orsay Group, Physics of Condensed Matter
6, 307 (1967).
4. G. Deutscher, Sol. St. Commun.
9, 891 (1971).
5. C. Valette, Sol. St. Commun.
9, 894 (1971).