Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1986_40_5_a6, author = {L. P. Vlasov}, title = {The existence of elements of best approximation in the complex space~$C(Q)$}, journal = {Matemati\v{c}eskie zametki}, pages = {627--634}, publisher = {mathdoc}, volume = {40}, number = {5}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1986_40_5_a6/} }
L. P. Vlasov. The existence of elements of best approximation in the complex space~$C(Q)$. Matematičeskie zametki, Tome 40 (1986) no. 5, pp. 627-634. http://geodesic.mathdoc.fr/item/MZM_1986_40_5_a6/