@article{MZM_1974_16_4_a1,
     author = {A. A. Agrachev},
     title = {On superpositions of continuous functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {517--522},
     publisher = {mathdoc},
     volume = {16},
     number = {4},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_4_a1/}
}