@article{MZM_1996_59_3_a17,
     author = {A. D. Izaak},
     title = {Widths of {H\"older--Nikol'skij} classes and finite-dimensional subsets in spaces with mixed norm},
     journal = {Matemati\v{c}eskie zametki},
     pages = {459--461},
     publisher = {mathdoc},
     volume = {59},
     number = {3},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_59_3_a17/}
}