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@article{IVM_1991_1_a4, author = {N. M. Isakov and F. {\CYRM}{\cyru}{\cyrk}{\cyra}{\cyrm}{\cyrb}{\cyra}}, title = {Local approximations of approximately differentiable functions}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {28--32}, publisher = {mathdoc}, number = {1}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1991_1_a4/} }
N. M. Isakov; F. Мукамба. Local approximations of approximately differentiable functions. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1991), pp. 28-32. http://geodesic.mathdoc.fr/item/IVM_1991_1_a4/