%0 Journal Article %A V. D. Taku %T Hyperplanes of symmetry of a system of differential equations %J Differencialʹnye uravneniâ %D 1978 %P 1332-1334 %V 14 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1978_14_7_a23/ %G ru %F DE_1978_14_7_a23