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@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/} }
A. G. Vitushkin. A proof of upper semicontinuity of a set variation. Doklady Akademii Nauk, Tome 166 (1966) no. 5, pp. 1022-1025. http://geodesic.mathdoc.fr/item/DAN_1966_166_5_a2/