@article{EJDE_2011__2011__a88,
     author = {Wen, Guo-Chun},
     title = {Oblique derivative problems for second-order hyperbolic equations with degenerate curve},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2011},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a88/}
}