1. For recent discussions see volumes in Refs. 2 and 3.
2. Fermiology of High-Tc Superconductors,1991
3. Electronic Structure and Fermiology of High-Tc Superconductors,1992
4. For early work on twinned Y123 crystals see Refs. 5–7, for the more recent studies of untwinned single crystals see Refs. 8–14.
5. Positron annihilation and superconductivity