TY  - JOUR
AU  - A. I. Propoi
AU  - A. V. Pukhlikov
TI  - Quadratic approximation in nonlinear extremal problems
JO  - Doklady Akademii Nauk
PY  - 1993
SP  - 425
EP  - 427
VL  - 331
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1993_331_4_a11/
LA  - ru
ID  - DAN_1993_331_4_a11
ER  -