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@article{MZM_1987_41_4_a6, author = {N. M. Isakov}, title = {A global property of approximately differentiable functions}, journal = {Matemati\v{c}eskie zametki}, pages = {500--508}, publisher = {mathdoc}, volume = {41}, number = {4}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_4_a6/} }
N. M. Isakov. A global property of approximately differentiable functions. Matematičeskie zametki, Tome 41 (1987) no. 4, pp. 500-508. http://geodesic.mathdoc.fr/item/MZM_1987_41_4_a6/