%0 Journal Article %A A. F. Palistrant %T Application of three-dimensional point groups of the $P$-symmetry to the derivation %J Doklady Akademii Nauk %D 1981 %P 884-888 %V 260 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1981_260_4_a26/ %G ru %F DAN_1981_260_4_a26