@article{EJDE_1999__1999__a50,
     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},
     publisher = {mathdoc},
     volume = {1999},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1999__1999__a50/}
}