%0 Journal Article %A G. D. Ilyushin %A L. N. Dem’yanets %A L. L. Vistin %T Hydrothermal crystallization and the crystal structure of $\mathrm{Na}_4\mathrm{Hf}_2\mathrm{Ge}_3\mathrm{O}_{12}$ ion conductor %J Doklady Akademii Nauk %D 1985 %P 622-626 %V 285 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1985_285_3_a25/ %G ru %F DAN_1985_285_3_a25