@article{TM_2001_232_a15,
     author = {N. P. Korneichuk},
     title = {Best {Approximation} and {Symmetric} {Decreasing} {Rearrangements} of {Functions}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {179--193},
     publisher = {mathdoc},
     volume = {232},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2001_232_a15/}
}