DEPENDENCE OF THE ELECTRONIC STRUCTURE OF YBa2Cu3O7-∂ CERAMICS ON OXYGEN STOICHIOMETRY : A PHOTOEMISSION AND PHOTOABSORPTION STUDY M. Maurer, T. Gourieux, G. Krill, M. F. Ravet, H. Tolentino et A. FontaineJ. Phys. Colloques, 49 C8 (1988) C8-2131-C8-2132DOI: https://doi.org/10.1051/jphyscol:19888953