@article{IM2_1974_8_4_a7,
     author = {V. K. Dzyadyk},
     title = {The approximation method for approximating solutions of linear differential equations by algebraic polynomials},
     journal = {Izvestiya. Mathematics},
     pages = {937--966},
     year = {1974},
     volume = {8},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1974_8_4_a7/}
}