Fizika Tverdogo Tela, 1983 Volume 25, Issue 7,Pages 2066–2072(Mi ftt3881)
Anharmonic interaction of degenerate local vibrations of $\mathrm{CrO}^{2-}_{4}$–$\mathrm{Ag}^{+}$ and $\mathrm{WO}^{2-}_{4}$–$\mathrm{Ag}^{+}$ complexes in $\mathrm{KBr}$ and $\mathrm{KI}$ crystals