%0 Journal Article %A T. V. Chekmarev %T Generalization of a theorem relating to a system of Euler–Poisson–Darboux equations %J Differencialʹnye uravneniâ %D 1983 %P 1089-1090 %V 19 %N 6 %U http://geodesic.mathdoc.fr/item/DE_1983_19_6_a24/ %G ru %F DE_1983_19_6_a24