@article{TM_1987_180_a18,
     author = {\`E. S. Belinskii},
     title = {Approximation by a~{\textquotedblleft}floating{\textquotedblright} system of exponentials on classes of periodic smooth functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {46--47},
     year = {1987},
     volume = {180},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1987_180_a18/}
}