@article{MZM_1987_41_5_a2,
     author = {{\DJ}inh Dung},
     title = {Best linear methods for approximation of classes of periodic functions of several variables},
     journal = {Matemati\v{c}eskie zametki},
     pages = {646--653},
     publisher = {mathdoc},
     volume = {41},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_5_a2/}
}