Magneto-Optical Properties of Pr, Ni- and Ce, Ni-Substituted YIG Epitaxial Films Prepared by Sputtering M. Gomi, H. Toyoshima et T. Yamada J. Phys. IV France, 07 C1 (1997) C1-723-C1-724 DOI: 10.1051/jp4:19971295