%0 Journal Article %A B. A. Nadykto %T On isotope mass shifts of energy levels of helium-like and lithium-like ions %J Doklady Akademii Nauk %D 1994 %P 41-43 %V 334 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1994_334_1_a11/ %G ru %F DAN_1994_334_1_a11