Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1997_219_a20, author = {S. B. Stechkin}, title = {Turan's {Problem} for {Trigonometric} {Sums}}, journal = {Informatics and Automation}, pages = {335--339}, publisher = {mathdoc}, volume = {219}, year = {1997}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1997_219_a20/} }
S. B. Stechkin. Turan's Problem for Trigonometric Sums. Informatics and Automation, Approximation theory. Harmonic analysis, Tome 219 (1997), pp. 335-339. http://geodesic.mathdoc.fr/item/TRSPY_1997_219_a20/