TY  - JOUR
AU  - E. E. Barbashina
TI  - A Compact Formula for the Third Variation and Necessary Optimality Conditions
JO  - Differencialʹnye uravneniâ
PY  - 2002
SP  - 414
EP  - 415
VL  - 38
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2002_38_3_a18/
LA  - ru
ID  - DE_2002_38_3_a18
ER  -