Fizika Tverdogo Tela, 1990 Volume 32, Issue 11,Pages 3214–3219(Mi ftt6489)
Study of the hidden structure in the spectra of $\mathrm{Gd}^{3+}$ ions in the superionic conductors $\mathrm{Na}_{5}\mathrm{RESi}_{4}\mathrm{O}_{12}$ with intrinsic cation disorder