@article{DAN_1961_138_3_a4,
     author = {V. N. Burov},
     title = {Approximation of functions by polynomials satisfying non-linear relations},
     journal = {Doklady Akademii Nauk},
     pages = {515--517},
     publisher = {mathdoc},
     volume = {138},
     number = {3},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_138_3_a4/}
}