@article{ZNSL_2020_491_a0,
     author = {M. V. Babushkin},
     title = {Estimates for the constant in a {Jackson} type inequality for periodic functions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--26},
     publisher = {mathdoc},
     volume = {491},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2020_491_a0/}
}