Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1993_53_3_a4, author = {V. I. Ivanov}, title = {On the {Jackson} theorem in~$L_2$ for {Preiss} systems}, journal = {Matemati\v{c}eskie zametki}, pages = {37--50}, publisher = {mathdoc}, volume = {53}, number = {3}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1993_53_3_a4/} }
V. I. Ivanov. On the Jackson theorem in~$L_2$ for Preiss systems. Matematičeskie zametki, Tome 53 (1993) no. 3, pp. 37-50. http://geodesic.mathdoc.fr/item/MZM_1993_53_3_a4/