@article{IM2_1984_23_2_a5,
     author = {V. A. Kofanov},
     title = {Approximation in the mean of classes of differentiable functions by algebraic polynomials},
     journal = {Izvestiya. Mathematics },
     pages = {353--365},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1984},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1984_23_2_a5/}
}