@article{TM_1967_88_a6,
     author = {N. I. Chernykh},
     title = {The approximation of functions by polynomials with constraints},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {75--130},
     publisher = {mathdoc},
     volume = {88},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1967_88_a6/}
}