PHOTO-INDUCED EFFECT ON THE PERMEABILITY OF YIG SINGLE CRYSTALS WITH Pb IMPURITY N. ICHINOSE, H. YOKOYAMA, K. HISATAKE et K. OHTA J. Phys. Colloques, 38 C1 (1977) C1-215-C1-217 DOI: 10.1051/jphyscol:1977145