@article{DAN_1963_153_2_a8,
     author = {I. Yu. Ryzhakov},
     title = {On a problem of {S.\,N.~Bernstein}},
     journal = {Doklady Akademii Nauk},
     pages = {282--285},
     publisher = {mathdoc},
     volume = {153},
     number = {2},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_153_2_a8/}
}