@incollection{JEDP_1987____A8_0, author = {Ferruccio Colombini}, title = {Quelques r\'esultats de non r\'esolubilit\'e locale pour des \'equations hyperboliques}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {8}, pages = {1--10}, publisher = {\'Ecole polytechnique}, year = {1987}, zbl = {0647.35049}, mrnumber = {88k:35114}, language = {fr}, url = {https://proceedings.centre-mersenne.org/item/JEDP_1987____A8_0/} }