@article{TIMM_2008_14_3_a1,
     author = {A. G. Babenko and Yu. V. Kryakin},
     title = {Integral approximation of the characteristic function of an interval by trigonometric polynomials},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {19--37},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2008_14_3_a1/}
}