TY  - JOUR
AU  - Thomas G. Berry
AU  - Sarel Venter
TI  - Integral formulae associated with non-parameter invariant multiple integral problems of arbitrary order in the calculus of variations.
JO  - Aequationes mathematicae
PY  - 1980
SP  - 200
EP  - 224
VL  - 21
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AM2_1980__21_182431/
ID  - AM2_1980__21_182431
ER  -