@article{TM_1989_187_a13,
     author = {A. P. Terekhin},
     title = {Approximation in~$L_p$ by spherical polynomials and differential classes of functions on sphere},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {216--226},
     publisher = {mathdoc},
     volume = {187},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1989_187_a13/}
}