Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1981_29_1_a10, author = {V. N. Temlyakov}, title = {Relations between best approximations of functions of two variables}, journal = {Matemati\v{c}eskie zametki}, pages = {95--106}, publisher = {mathdoc}, volume = {29}, number = {1}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1981_29_1_a10/} }
V. N. Temlyakov. Relations between best approximations of functions of two variables. Matematičeskie zametki, Tome 29 (1981) no. 1, pp. 95-106. http://geodesic.mathdoc.fr/item/MZM_1981_29_1_a10/