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@article{DAN_1978_243_5_a11, author = {Yu. F. Strugov}, title = {On a differential property of an extremal mapping quasi-conformal in the mean}, journal = {Doklady Akademii Nauk}, pages = {1138--1141}, publisher = {mathdoc}, volume = {243}, number = {5}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1978_243_5_a11/} }
Yu. F. Strugov. On a differential property of an extremal mapping quasi-conformal in the mean. Doklady Akademii Nauk, Tome 243 (1978) no. 5, pp. 1138-1141. http://geodesic.mathdoc.fr/item/DAN_1978_243_5_a11/