MAGNETIC FIELD DEPENDENCE OF THE 57Fe HYPERFINE INTERACTION IN Y(Fe0.1Co0.9)2 AND (Ho0.1Y0.9) (Fe0.1Co0.9)2 R. Haferl, W. Steiner et H. Ortbauer J. Phys. Colloques, 41 C1 (1980) C1-195-C1-196 DOI: 10.1051/jphyscol:1980159