@article{SEDP_1974-1975____A22_0,
     author = {Duistermaat, J. J. and Singer, I. M.},
     title = {Isomorphismes entre alg\`ebres d'op\'erateurs pseudo-diff\'erentiels},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:24},
     pages = {1--8},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1974-1975},
     zbl = {0306.58017},
     language = {fr},
     url = {http://archive.numdam.org/item/SEDP_1974-1975____A22_0/}
}