TY  - JOUR
AU  - A. A. Agrachev
AU  - R. V. Gamkrelidze
TI  - Symplectic geometry and conditions necessary conditions for optimality
JO  - Sbornik. Mathematics
PY  - 1992
SP  - 29
EP  - 45
VL  - 72
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1992_72_1_a1/
LA  - en
ID  - SM_1992_72_1_a1
ER  -