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@article{DAN_1973_212_3_a3, author = {V. Ya. Gutlyanskii}, title = {The area principle for a certain class of quasiconformal mappings}, journal = {Doklady Akademii Nauk}, pages = {540--543}, publisher = {mathdoc}, volume = {212}, number = {3}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1973_212_3_a3/} }
V. Ya. Gutlyanskii. The area principle for a certain class of quasiconformal mappings. Doklady Akademii Nauk, Tome 212 (1973) no. 3, pp. 540-543. http://geodesic.mathdoc.fr/item/DAN_1973_212_3_a3/