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@article{IVM_1967_8_a8, author = {A. G. Ugodchikov}, title = {Differentiation of functions which realize an approximate conformal mapping}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {76--81}, publisher = {mathdoc}, number = {8}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1967_8_a8/} }
A. G. Ugodchikov. Differentiation of functions which realize an approximate conformal mapping. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1967), pp. 76-81. http://geodesic.mathdoc.fr/item/IVM_1967_8_a8/