@article{GDZPPN002550415,
title = {Integral formulae associated with non-parameter invariant multiple integral problems of arbitrary order in the calculus of variations.},
journal = {Aequationes mathematicae},
volume = {20},
year = {1980},
pages = {200-224},
zbl = {0459.49032},
url = {http://dml.mathdoc.fr/item/GDZPPN002550415}
}
Berry, Thomas G.; Venter, Sarel. Integral formulae associated with non-parameter invariant multiple integral problems of arbitrary order in the calculus of variations.. Aequationes mathematicae, Tome 20 (1980) pp. 200-224. http://gdmltest.u-ga.fr/item/GDZPPN002550415/