Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1981_29_2_a14, author = {V. A. Yudin}, title = {Multidimensional {Jackson} theorem in~$L_2$}, journal = {Matemati\v{c}eskie zametki}, pages = {309--315}, publisher = {mathdoc}, volume = {29}, number = {2}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1981_29_2_a14/} }
V. A. Yudin. Multidimensional Jackson theorem in~$L_2$. Matematičeskie zametki, Tome 29 (1981) no. 2, pp. 309-315. http://geodesic.mathdoc.fr/item/MZM_1981_29_2_a14/