@article{ZNSL_2012_404_a1,
     author = {O. L. Vinogradov},
     title = {Sharp estimates of best approximations in terms of holomorphic functions of {Weierstrass-type} operators},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {18--60},
     publisher = {mathdoc},
     volume = {404},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2012_404_a1/}
}