STUDY OF THE ANISOTROPIC PROPERTIES OF YBa2Cu3O7 SINGLE CRYSTALS BY MICROWAVE ABSORPTION M. Poirier, G. Quirion, J. P. Thiel and F. d'Orazio J. Phys. Colloques, 49 C8 (1988) C8-2233-C8-2234 DOI: 10.1051/jphyscol:198881000