@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/}
}