TY  - JOUR
AU  - V. I. Bernik
TI  - Induced extremal surfaces
JO  - Sbornik. Mathematics
PY  - 1977
SP  - 413
EP  - 421
VL  - 32
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1977_32_4_a1/
LA  - en
ID  - SM_1977_32_4_a1
ER  -