@article{SM_1988_60_1_a1,
     author = {\`E. S. Belinskii},
     title = {Approximation by a ``floating'' system of exponentials on classes of smooth periodic functions},
     journal = {Sbornik. Mathematics},
     pages = {19--27},
     publisher = {mathdoc},
     volume = {60},
     number = {1},
     year = {1988},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1988_60_1_a1/}
}