%0 Journal Article %A N. I. Nagnibida %T On roots of the multiple integration operator in the space of functions analytic in a~disk %J Izvestiya. Mathematics %D 1979 %P 685-693 %V 13 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1979_13_3_a7/ %G en %F IM2_1979_13_3_a7