Umbrella Structure in Pr, Nd and Yb Substituted YIG Studied by 57Fe NMR J. Englich, J. Kohout, H. Stepánková, P. Novák, M. Nekvasil et H. Lütgemeier J. Phys. IV France, 07 C1 (1997) C1-295-C1-296 DOI: 10.1051/jp4:19971117