%0 Journal Article %A V. A. Il'in %T The Riesz equisummability of expansions in eigenfunctions and in the $n$-dimensional Fourier integral %J Informatics and Automation %D 1972 %P 151-162 %V 128 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1972_128_a8/ %G ru %F TRSPY_1972_128_a8