@article{IM2_1985_24_3_a6,
     author = {A. I. Vahabov},
     title = {On~equiconvergence of expansions in trigonometric {Fourier} series and in principal functions of ordinary differential operators},
     journal = {Izvestiya. Mathematics },
     pages = {567--582},
     publisher = {mathdoc},
     volume = {24},
     number = {3},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1985_24_3_a6/}
}