@article{ZVMMF_1963_3_2_a12,
     author = {I. F. Sharygin},
     title = {A lower estimate for the error of quadrature formulae for certain classes of functions},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {370--376},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1963_3_2_a12/}
}