TY  - JOUR
AU  - Yu. F. Strugov
TI  - On a differential property of an extremal mapping quasi-conformal in the mean
JO  - Doklady Akademii Nauk
PY  - 1978
SP  - 1138
EP  - 1141
VL  - 243
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1978_243_5_a11/
LA  - ru
ID  - DAN_1978_243_5_a11
ER  -