@article{SEDP_1977-1978____A16_0,
     author = {Melrose, R. B. and Sj\"ostrand, J.},
     title = {Propagation de singularit\'es pour des probl\`emes aux limites d'ordre 2},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:15},
     pages = {1--9},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1977-1978},
     mrnumber = {504144},
     zbl = {0383.35043},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1977-1978____A16_0/}
}