MAGNETIC RESONANCE IN FERROMAGNETIC CRYSTALS WITH M2CuX4.2H2O STRUCTURE T. O. KLAASSEN et N. J. POULISJ. Phys. Colloques, 32 C1 (1971) C1-1157-C1-1158DOI: https://doi.org/10.1051/jphyscol:19711414
