1. See for a recent review: Coherence in Superconducting networks, J.E. Mooij and G.B. Schön, eds., Physica B 152 (1988)
2. Proceedings of the Electronic properties of 2 D systems, to appear in Surf. Sc. (1990), and references therein
3. V.L. Ginzburg and L. Landau, Zh Eksp. Teor. Fiz. 20, 1064 (1950)
4. P.G. de Gennes, Superconductivity of metals and alloys, W.A. Benjamin, ed., New York (1966)
5. A.A. Abrikosov, Zh. Eksp. Teor. Fiz. 32, 1442 (1957) [Sov. Phys. JETP 5, 1174(1957)]