@article{SM_1983_45_2_a8,
     author = {O. G. Parfenov},
     title = {Widths of a class of analytic functions},
     journal = {Sbornik. Mathematics},
     pages = {283--289},
     year = {1983},
     volume = {45},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1983_45_2_a8/}
}