@incollection{JEDP_1979____A16_0, author = {Alain Grigis}, title = {Propagation des singularit\'es pour des op\'erateurs pseudodiff\'erentiels \`a caract\'eristiques doubles}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {16}, pages = {1--6}, publisher = {\'Ecole polytechnique}, year = {1979}, zbl = {0405.35077}, language = {fr}, url = {https://proceedings.centre-mersenne.org/item/JEDP_1979____A16_0/} }