@article{ZNSL_2012_404_a8,
     author = {V. V. Zhuk},
     title = {Estimates of best approximations of periodic function by linear combinations values of the function itself and its primitives},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {157--174},
     publisher = {mathdoc},
     volume = {404},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2012_404_a8/}
}