@article{DAN_1975_225_3_a3,
     author = {V. A. Il'in},
     title = {On the equiconvergence of an expansion in a trigonometric {Fourier} series and the eigenfunctions of the {Keldys} pencil of ordinary nonselfadjoint differential operators},
     journal = {Doklady Akademii Nauk},
     pages = {497--499},
     publisher = {mathdoc},
     volume = {225},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_225_3_a3/}
}