1. TUNNELING MEASUREMENTS OF THE ENERGY GAP IN HIGH-Tc SUPERCONDUCTORS
2. Introduction to Superconductivity;Tinkham,1980
3. Theory of Superconductivity;Schrieffer,1964
4. Superconductivity of Metals and Alloys;DeGennes,1989
5. Energy Gap in Superconductors Measured by Electron Tunneling