%0 Journal Article %A A. I. Vahabov %T On~equiconvergence of expansions in trigonometric Fourier series and in principal functions of ordinary differential operators %J Izvestiya. Mathematics %D 1985 %P 567-582 %V 24 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1985_24_3_a6/ %G en %F IM2_1985_24_3_a6