@article{EJDE_1999__1999__a99,
     author = {Mu\~noz-Lecanda,  Miguel C. and Rom\'an-Roy,  N.},
     title = {Implicit quasilinear differential systems: {A} geometrical approach},
     journal = {Electronic journal of differential equations},
     year = {1999},
     volume = {1999},
     zbl = {0930.34032},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1999__1999__a99/}
}