The Effect of Diamagnetic Defect in YIG on the Hyperfine Field Anisotropy J. Kohout, H. Stepankova, J. Englich, P. Novak et H. Lütgemeier J. Phys. IV France, 07 C1 (1997) C1-449-C1-450 DOI: 10.1051/jp4:19971182