@article{MZM_1974_16_2_a1,
     author = {N. E. Lushpai},
     title = {Best quadrature formula on the class $W_*^rL_2$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {193--204},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_2_a1/}
}