@article{MZM_1977_21_3_a8,
     author = {I. F. Sharygin},
     title = {A~lower bound for the error of a~formula for approximate summation in the class $E_{s,p}(C)$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {371--375},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_3_a8/}
}