@article{SEDP_1987-1988____A4_0,
     author = {Unterberger, A.},
     title = {Op\'erateurs pseudodiff\'erentiels et relativit\'e},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:4},
     pages = {1--8},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1987-1988},
     mrnumber = {1018176},
     zbl = {0698.35171},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1987-1988____A4_0/}
}