@article{DEMR_2016_5_a1,
     author = {G. G. Akniev},
     title = {Approximation properties of {Fourier} sums for $2\pi$-periodic piecewise linear continuous functions},
     journal = {Daghestan Electronic Mathematical Reports},
     pages = {13--19},
     publisher = {mathdoc},
     volume = {5},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DEMR_2016_5_a1/}
}