@article{BSMF_1999__127_3_363_0,
     author = {Beffa, Gloria Mar{\'\i}},
     title = {The theory of differential invariants and {KDV} hamiltonian evolutions},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {363--391},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {127},
     number = {3},
     year = {1999},
     doi = {10.24033/bsmf.2353},
     mrnumber = {2001m:37142},
     zbl = {01357366},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/bsmf.2353/}
}