%0 Journal Article %A V. A. Il'in %T The Riesz equisummability of expansions in eigenfunctions and in the $n$-dimensional Fourier integral %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1972 %P 151-162 %V 128 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_1972_128_a8/ %G ru %F TM_1972_128_a8