@article{COMIM_2021__29_1_a5,
     author = {Saunders, David J.},
     title = {Jets and the variational calculus},
     journal = {Communications in Mathematics},
     pages = {91--114},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {2021},
     mrnumber = {4251307},
     zbl = {07413359},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/COMIM_2021__29_1_a5/}
}