@article{ZNSL_1984_135_a15,
     author = {N. A. Shirokov},
     title = {On a~theorem of {A.~G.~Vitushkin}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {178--181},
     year = {1984},
     volume = {135},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_135_a15/}
}