Fizika Tverdogo Tela, 1985 Volume 27, Issue 3,Pages 625–630(Mi ftt1807)
Hyperfine structure of $\mathrm{Pb}_{5}\mathrm{Ge}_{3}\mathrm{O}_{11}:\mathrm{Gd}^{157}$ electron-paramagnetic-res spectrum and effects of discrete and frequency discrete saturation