%0 Journal Article %A E. G. Tsitsishvili %T Natural birefringence of cubic crystals in the exciton part of spectrum %J Doklady Akademii Nauk %D 1984 %P 1404-1407 %V 275 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1984_275_6_a29/ %G ru %F DAN_1984_275_6_a29