%0 Journal Article %A L. I. Devyatkova %A O. N. Ivanova %A V. V. Mikhailin %A S. N. Rudnev %A B. P. Sobolev %A T. V. Uvarova %A S. P. Chernov %T Experimental study of the $4f$--$5d$ transitions of $\mathrm{Ho}^{3+}$, $\mathrm{Er}^{3+}$, $\mathrm{Tm}^{3+}$, and $\mathrm{Yb}^{3+}$ in $\mathrm{BaY}_2\mathrm{F}_8$ %J Doklady Akademii Nauk %D 1985 %P 1339-1342 %V 283 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1985_283_6_a14/ %G ru %F DAN_1985_283_6_a14