@article{DAN_1966_166_5_a2,
     author = {A. G. Vitushkin},
     title = {A proof of upper semicontinuity of a set variation},
     journal = {Doklady Akademii Nauk},
     pages = {1022--1025},
     publisher = {mathdoc},
     volume = {166},
     number = {5},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_166_5_a2/}
}