@article{DAN_1985_284_6_a1,
     author = {\`E. S. Belinskii},
     title = {Approximation of periodic functions of several variables by a {\textquotedblleft}floating{\textquotedblright} system of exponentials, and trigonometric widths},
     journal = {Doklady Akademii Nauk},
     pages = {1294--1297},
     year = {1985},
     volume = {284},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_284_6_a1/}
}