@article{MAN_1992__293_4_164978,
     author = {J\"urgen Jost and Xiao-Wei Peng},
     title = {Group actions, gauge transformations, and the calculus of variations.},
     journal = {Mathematische Annalen},
     pages = {595--622},
     publisher = {mathdoc},
     volume = {293},
     number = {4},
     year = {1992},
     zbl = {0772.53011},
     url = {http://geodesic.mathdoc.fr/item/MAN_1992__293_4_164978/}
}