@article{SM_1971_15_4_a0,
     author = {K. I. Babenko},
     title = {Some remarks on approximation of functions of several variables},
     journal = {Sbornik. Mathematics},
     pages = {493--511},
     year = {1971},
     volume = {15},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_15_4_a0/}
}