@article{MT_2021_24_2_a8,
     author = {O. G. Rovenskaya},
     title = {An exact constant on the estimation of the approximation error of classes of differentiable functions by the second-order {Cesaro} means},
     journal = {Matemati\v{c}eskie trudy},
     pages = {150--159},
     publisher = {mathdoc},
     volume = {24},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2021_24_2_a8/}
}