@article{UZMU_1956_181_181_a8,
     author = {N. K. Bari},
     title = {On locally best approximation of periodic functions by trigonometric polynomials},
     journal = {Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta},
     pages = {107--138},
     publisher = {mathdoc},
     volume = {181},
     number = {181},
     year = {1956},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZMU_1956_181_181_a8/}
}