@article{ZNSL_2012_404_a7,
     author = {V. V. Zhuk},
     title = {Inequalities of type generalized {Jackson} theorem for best approximations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {135--156},
     publisher = {mathdoc},
     volume = {404},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2012_404_a7/}
}