@article{DAN_1986_289_3_a6,
     author = {S. M. Nikol'skii and P. I. Lizorkin},
     title = {Inequalities for harmonic, spherical and algebraic polynomials},
     journal = {Doklady Akademii Nauk},
     pages = {541--545},
     publisher = {mathdoc},
     volume = {289},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_289_3_a6/}
}