@article{TIMM_2012_18_1_a6,
     author = {A. G. Babenko and Yu. V. Kryakin and V. A. Yudin},
     title = {One-sided approximation in~$L$ of the characteristic function of an interval by trigonometric polynomials},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {82--95},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2012_18_1_a6/}
}