@article{MZM_1972_11_2_a0,
     author = {A. A. Gonchar},
     title = {Piecewise polynomial approximation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {129--134},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1972_11_2_a0/}
}