%0 Journal Article %A R. Ya. Levina %A N. P. Shusherina %A M. Yu. Lourier %T $\delta$-Lactones. Transformation of the dibromides of unsaturated $\delta$-lactones into bromine substituted $\delta$-ketone %J Doklady Akademii Nauk %D 1957 %P 820-823 %V 113 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1957_113_4_a22/ %G ru %F DAN_1957_113_4_a22