@article{JEDP_1979____A16_0, author = {Grigis, Alain}, title = {Propagation des singularit\'es pour des op\'erateurs pseudodiff\'erentiels \`a caract\'eristiques doubles}, journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {16}, publisher = {Ecole polytechnique}, year = {1979}, zbl = {0405.35077}, language = {fr}, url = {http://archive.numdam.org/item/JEDP_1979____A16_0/} }