NEAR IR FARADAY ROTATION ON YIG DOPED WITH TETRAVALENT AND PENTAVALENT ELEMENTS F. D'Orazio, F. Giammaria, F. Lucari et G. Parone J. Phys. Colloques, 49 C8 (1988) C8-969-C8-970 DOI: 10.1051/jphyscol:19888443