Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1962_143_1_a13, author = {N. A. Sapogov}, title = {Adding strength to {Lizinskii--Harsiladze's} theorem on polynomial approximations}, journal = {Doklady Akademii Nauk}, pages = {53--55}, publisher = {mathdoc}, volume = {143}, number = {1}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_1_a13/} }
N. A. Sapogov. Adding strength to Lizinskii--Harsiladze's theorem on polynomial approximations. Doklady Akademii Nauk, Tome 143 (1962) no. 1, pp. 53-55. http://geodesic.mathdoc.fr/item/DAN_1962_143_1_a13/