@article{TM_1997_218_a30,
     author = {V. A. Yudin},
     title = {On trigonometric series with positive partial sums},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {444--447},
     publisher = {mathdoc},
     volume = {218},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1997_218_a30/}
}