Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1983_33_4_a7, author = {L. A. Shaginyan}, title = {Trigonometric series with nonnegative partial sums}, journal = {Matemati\v{c}eskie zametki}, pages = {559--570}, publisher = {mathdoc}, volume = {33}, number = {4}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1983_33_4_a7/} }
L. A. Shaginyan. Trigonometric series with nonnegative partial sums. Matematičeskie zametki, Tome 33 (1983) no. 4, pp. 559-570. http://geodesic.mathdoc.fr/item/MZM_1983_33_4_a7/