On locally best approximation of periodic functions by trigonometric polynomials
Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta, Mathematics. Vol. VIII, Tome 181 (1956) no. 181, pp. 107-138

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     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/}
}
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N. K. Bari. On locally best approximation of periodic functions by trigonometric polynomials. Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta, Mathematics. Vol. VIII, Tome 181 (1956) no. 181, pp. 107-138. http://geodesic.mathdoc.fr/item/UZMU_1956_181_181_a8/