%0 Journal Article %A B. P. Sobolev %A D. A. Mineev %A V. P. Pashutin %T Low-temperature hexagonal modification of $\mathrm{NaYF}_4$ having the gagarinite structure %J Doklady Akademii Nauk %D 1963 %P 791-794 %V 150 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1963_150_4_a22/ %G ru %F DAN_1963_150_4_a22