HYPERFINE FIELDS AT 3d IMPURITIES IN FERROMAGNETIC GdZn AND GdCd Y. Kasamatsu, K. Kojima, T. Hihara et T. Kamigaichi J. Phys. Colloques, 49 C8 (1988) C8-389-C8-390 DOI: 10.1051/jphyscol:19888176