%0 Journal Article %A I. G. Guseinov %A R. M. Gadzhimirzaev %T Two-dimensional limit series in ultraspherical Jacobi polynomials and their approximative properties %J Izvestiya of Saratov University. Mathematics. Mechanics. Informatics %D 2021 %P 422-433 %V 21 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/ISU_2021_21_4_a0/ %G ru %F ISU_2021_21_4_a0