@article{TRSPY_1987_180_a123,
     author = {A. I. Stepanets},
     title = {Approximation of periodic functions by {Fourier} sums},
     journal = {Informatics and Automation},
     pages = {202--204},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a123/}
}