TY  - JOUR
AU  - Viorel Barbu
TI  - Necessary Conditions for Multiple Integral Problem in the Calculus of Variations.
JO  - Mathematische Annalen
PY  - 1982
SP  - 175
EP  - 190
VL  - 260
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1982__260_163665/
ID  - MAN_1982__260_163665
ER  -