@article{SEDP_1987-1988____A13_0,
     author = {Dencker, N.},
     title = {The propagation of singularities for pseudo-differential operators with self-tangential characteristics},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:13},
     pages = {1--14},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1987-1988},
     mrnumber = {1018185},
     zbl = {0682.35110},
     language = {en},
     url = {http://www.numdam.org/item/SEDP_1987-1988____A13_0/}
}