%0 Journal Article %A A. A. Grib %T The symmetry group of solutions of the Klein--Gordon equation in the exterior vector field %J Differencialʹnye uravneniâ %D 1966 %P 688-694 %V 2 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1966_2_5_a9/ %G ru %F DE_1966_2_5_a9