@article{02216887,
title = {Hadamard's fundamental solution and multiple-characteristic problems.},
journal = {Rendiconti del Seminario Matematico},
volume = {56},
year = {1998},
pages = {1-35},
zbl = {1098.35518},
language = {en},
url = {http://dml.mathdoc.fr/item/02216887}
}
Chi, M.Y. Hadamard's fundamental solution and multiple-characteristic problems.. Rendiconti del Seminario Matematico, Tome 56 (1998) pp. 1-35. http://gdmltest.u-ga.fr/item/02216887/