@article{DAN_1962_143_1_a13,
     author = {N. A. Sapogov},
     title = {Adding strength to {Lizinskii{\textendash}Harsiladze's} theorem on polynomial approximations},
     journal = {Doklady Akademii Nauk},
     pages = {53--55},
     year = {1962},
     volume = {143},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_1_a13/}
}