@article{SIGMA_2008_4_a57,
     author = {Dennis The},
     title = {Contact {Geometry} of {Hyperbolic} {Equations} of {Generic} {Type}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2008},
     volume = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2008_4_a57/}
}