Geodesic
EXISTENCE OF CONSERVATION LAWS IN NILPOTENT CASE
Acta mathematica Universitatis Comenianae, Tome 68 (1999) no. 2 
M. Mehdi. EXISTENCE OF CONSERVATION LAWS IN NILPOTENT CASE. Acta mathematica Universitatis Comenianae, Tome 68 (1999) no. 2. http://geodesic.mathdoc.fr/item/AMUC_1999_68_2_a3/
@article{AMUC_1999_68_2_a3,
     author = {M. Mehdi},
     title = {EXISTENCE {OF} {CONSERVATION} {LAWS} {IN} {NILPOTENT} {CASE}},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {1999},
     volume = {68},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/AMUC_1999_68_2_a3/}
}
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Voir la notice de l'article provenant de la source Comenius University

Using the Spencer-Goldschmidt version of the Cartan-Kahler theorem, we prove the local existence of conservation laws for analytical quasi-linear systems of two independent variables in the nilpotent and $2$-cyclic case.