@article{MZM_2020_108_5_a6,
     author = {S. N. Kudryavtsev},
     title = {Extension of {Functions} from {Isotropic} {Nikol'skii--Besov} {Spaces} and {Their} {Approximation} together with {Derivatives}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {714--724},
     publisher = {mathdoc},
     volume = {108},
     number = {5},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2020_108_5_a6/}
}