Fizika Tverdogo Tela, 1983 Volume 25, Issue 6,Pages 1664–1669(Mi ftt3789)
Concentration quenching and $\mathrm{Nd}^{3+}$ luminescence quantum efficiency in gamma-$\mathrm{La}_{2}\mathrm{S}_{3}$ semiconductive crystals and $\mathrm{La}_{2}\mathrm{S}_{3}\cdot 2\mathrm{Ga}_{2}\mathrm{O}_{3}$ glasses