%0 Journal Article %A V. S. Serov %T Fractional powers of a differential operator with singularity %J Differencialʹnye uravneniâ %D 1986 %P 134-142 %V 22 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1986_22_1_a15/ %G ru %F DE_1986_22_1_a15