@article{GDZPPN00233707X,
title = {Group actions, gauge transformations, and the calculus of variations.},
journal = {Mathematische Annalen},
volume = {293},
year = {1992},
pages = {595-622},
zbl = {0772.53011},
url = {http://dml.mathdoc.fr/item/GDZPPN00233707X}
}
Jost, Jürgen; Peng, Xiao-Wei. Group actions, gauge transformations, and the calculus of variations.. Mathematische Annalen, Tome 293 (1992) pp. 595-622. http://gdmltest.u-ga.fr/item/GDZPPN00233707X/