@article{IM2_2017_81_6_a2,
     author = {P. A. Borodin},
     title = {Approximation by sums of shifts of a~single function on the circle},
     journal = {Izvestiya. Mathematics },
     pages = {1080--1094},
     publisher = {mathdoc},
     volume = {81},
     number = {6},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2017_81_6_a2/}
}