%0 Journal Article %A V. I. Evsin %T The Holmgren problem for a certain equation with singular coefficients %J Differencialʹnye uravneniâ %D 1973 %P 41-48 %V 9 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1973_9_1_a5/ %G ru %F DE_1973_9_1_a5