"IMPURITY CONTRIBUTION TO THE LOW TEMPERATURE FMR LINEWIDTH OF Ag-DOPED CdCr2Se4 SINGLE CRYSTALS" J.M. Ferreira et M.D. Coutinho-Filho J. Phys. Colloques, 39 C6 (1978) C6-1007-C6-1009 DOI: 10.1051/jphyscol:19786445