%0 Journal Article %A Yu. I. Belyaev %T Quantitative estimation of slight admixtures of rare-earth elements by spectral analysis without the use of a reference standard %J Doklady Akademii Nauk %D 1960 %P 95-97 %V 133 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1960_133_1_a23/ %G ru %F DAN_1960_133_1_a23