@article{ZNSL_2013_418_a2,
     author = {M. V. Babushkin and V. V. Zhuk},
     title = {On the constants in inequalities of the generalized {Jackson} theorem type},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {28--59},
     publisher = {mathdoc},
     volume = {418},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2013_418_a2/}
}