%0 Journal Article %A S. G. Il'ina %T Exact formulas for the determination of optic constants $n$ and $\kappa$ based on the reflection %J Doklady Akademii Nauk %D 1971 %P 568-570 %V 200 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1971_200_3_a16/ %G ru %F DAN_1971_200_3_a16