@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},
     pages = {1--6},
     publisher = {Ecole polytechnique},
     year = {1979},
     zbl = {0405.35077},
     language = {fr},
     url = {http://www.numdam.org/item/JEDP_1979____A16_0/}
}