%0 Journal Article %A B. G. Granadchikova %A L. V. Nikol'skaya %A M. I. Samoilovich %T On the color nature of natural and synthetic sapphires and an express method of their identification %J Doklady Akademii Nauk %D 1979 %P 599-601 %V 246 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1979_246_3_a20/ %G ru %F DAN_1979_246_3_a20