1. C. Thomsen, R. Liu, A. Wittlin, L. Genzel, M. Cardona, W. König, M.V. Cabañas and E. García, Solid State Commun., in press; and references therein.
2. Raman scattering from high-Tcsuperconductors
3. R. Feile, U. Schmitt, P. Leiderer, J. Schubert, and U. Poppe, Z. Phys. in press: and references therein.
4. Cu-O vibrations ofBa2YCu3Ox
5. Effect of oxygen content on phonon Raman spectra of YBa2Cu3O7−δ