@article{IM2_2018_82_5_a3,
     author = {S. N. Kudryavtsev},
     title = {Extension of functions in non-isotropic {Nikolskii--Besov} spaces and
},
     journal = {Izvestiya. Mathematics },
     pages = {931--983},
     publisher = {mathdoc},
     volume = {82},
     number = {5},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2018_82_5_a3/}
}