TY  - JOUR
AU  - A. A. Agrachev
TI  - A~second-order necessary condition for optimality in the general nonlinear case
JO  - Sbornik. Mathematics
PY  - 1977
SP  - 493
EP  - 506
VL  - 31
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1977_31_4_a4/
LA  - en
ID  - SM_1977_31_4_a4
ER  -