SEARCH FOR Fe4+ IN YIG : Ca GARNET FILMS Z. Šimša, Šimšová, J. Zemek, P. E. Wigen et M. Pardavi-Horvath J. Phys. Colloques, 49 C8 (1988) C8-975-C8-976 DOI: 10.1051/jphyscol:19888446