@article{IM2_1989_32_1_a4,
     author = {K. Yu. Osipenko},
     title = {On~best and optimal quadrature formulas on~classes of bounded analytic functions},
     journal = {Izvestiya. Mathematics},
     pages = {77--97},
     year = {1989},
     volume = {32},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1989_32_1_a4/}
}