@incollection{JEDP_1975____93_0,
     author = {Louis Boutet de Monvel and Alain Grigis and Bernard Helffer},
     title = {Param\'etrixes d'op\'erateurs pseudo-diff\'erentiels \`a caract\'eristiques multiples},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     pages = {93--121},
     publisher = {\'Ecole polytechnique},
     year = {1975},
     mrnumber = {58 #12046},
     language = {fr},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1975____93_0/}
}