@article{DAN_1990_310_3_a6,
     author = {V. A. Opershtein},
     title = {A constructive characterization of the spaces $B_{pq}^\psi[-1,1]$ by means of approximations by algebraic polynomials},
     journal = {Doklady Akademii Nauk},
     pages = {542--545},
     publisher = {mathdoc},
     volume = {310},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_310_3_a6/}
}