@article{IVM_1987_1_a1,
     author = {A. N. Davidchik and A. A. Ligun},
     title = {On the {Jackson} constants in the approximation of functions by linear operators},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {8--15},
     publisher = {mathdoc},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1987_1_a1/}
}