@article{SM_1970_11_2_a1,
     author = {Yu. A. Brudnyi},
     title = {A multidimensional analog of a~theorem of {Whitney}},
     journal = {Sbornik. Mathematics},
     pages = {157--170},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1970_11_2_a1/}
}