Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1968_183_6_a4, author = {G. I. Natanson}, title = {Certain cases when {Fourier} sums give best order approximation}, journal = {Doklady Akademii Nauk}, pages = {1254--1257}, publisher = {mathdoc}, volume = {183}, number = {6}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1968_183_6_a4/} }
G. I. Natanson. Certain cases when Fourier sums give best order approximation. Doklady Akademii Nauk, Tome 183 (1968) no. 6, pp. 1254-1257. http://geodesic.mathdoc.fr/item/DAN_1968_183_6_a4/