%0 Journal Article %A V. A. Il'in %T On the equiconvergence of an expansion in a trigonometric Fourier series and the eigenfunctions of the Keldys pencil of ordinary nonselfadjoint differential operators %J Doklady Akademii Nauk %D 1975 %P 497-499 %V 225 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1975_225_3_a3/ %G ru %F DAN_1975_225_3_a3