@article{SM_1982_43_4_a4,
     author = {A. S. Shvedov},
     title = {Coconvex approximation of functions of several variables by polynomials},
     journal = {Sbornik. Mathematics},
     pages = {515--526},
     publisher = {mathdoc},
     volume = {43},
     number = {4},
     year = {1982},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1982_43_4_a4/}
}