@article{IM2_1970_4_3_a5,
     author = {S. Ya. Al'per and I. Yu. Vinogradova},
     title = {On approximation in the mean on curves in the complex plane by},
     journal = {Izvestiya. Mathematics},
     pages = {551--567},
     year = {1970},
     volume = {4},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1970_4_3_a5/}
}