@article{IVM_1973_12_a6,
     author = {N. E. Lushpai and V. M. Alkhimova},
     title = {On the question of best quadrature formulas for classes of differentiable functions},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {50--56},
     publisher = {mathdoc},
     number = {12},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1973_12_a6/}
}