Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1995_8_a1, author = {V. V. Arestov and V. Yu. Popov}, title = {Jackson inequalities on a sphere in $L_2$}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {13--20}, publisher = {mathdoc}, number = {8}, year = {1995}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1995_8_a1/} }
V. V. Arestov; V. Yu. Popov. Jackson inequalities on a sphere in $L_2$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1995), pp. 13-20. http://geodesic.mathdoc.fr/item/IVM_1995_8_a1/