Estimation of τ1 for the host Kramers' Ln3+ ions (Ln ≡ Nd, Sm and Yb) from the EPR linewidths of Gd3+ impurity ions in Ln2(SO4)3.8 H2O V.M. Malhotra et H.A. BuckmasterJ. Phys. France, 42 7 (1981) 1053-1061DOI: https://doi.org/10.1051/jphys:019810042070105300
