@article{AIHPC_1999__16_6_725_0, author = {Liu, Chun-Gen and Long, Yiming}, title = {Hyperbolic characteristics on star-shaped hypersurfaces}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, pages = {725--746}, publisher = {Gauthier-Villars}, volume = {16}, number = {6}, year = {1999}, zbl = {0988.37078}, mrnumber = {1720514}, language = {en}, url = {http://archive.numdam.org/item/AIHPC_1999__16_6_725_0/} }