@article{SEDP_1979-1980____A18_0,
     author = {Lebeau, G.},
     title = {Non holonomie dans un probl\`eme de diffraction},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:17},
     pages = {1--8},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1979-1980},
     mrnumber = {600702},
     zbl = {0446.35020},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1979-1980____A18_0/}
}