@article{RSM_1998__56_3_126552,
     author = {Chi, M.Y.},
     title = {Hadamard's fundamental solution and multiple-characteristic problems.},
     journal = {Rendiconti del seminario matematico},
     pages = {1--35},
     publisher = {mathdoc},
     volume = {56},
     number = {3},
     year = {1998},
     zbl = {1098.35518},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RSM_1998__56_3_126552/}
}