Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1991_49_1_a1, author = {\`E. S. Belinskii}, title = {Two extremal problems for trigonometric polynomials with a prescribed number of harmonics}, journal = {Matemati\v{c}eskie zametki}, pages = {12--18}, publisher = {mathdoc}, volume = {49}, number = {1}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1991_49_1_a1/} }
È. S. Belinskii. Two extremal problems for trigonometric polynomials with a prescribed number of harmonics. Matematičeskie zametki, Tome 49 (1991) no. 1, pp. 12-18. http://geodesic.mathdoc.fr/item/MZM_1991_49_1_a1/