@incollection{JEDP_1982____A2_0,
     author = {Charbonnel, Anne-Marie},
     title = {Spectre conjoint d'op\'erateurs pseudodiff\'erentiels qui commutent},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {2},
     pages = {1--9},
     publisher = {Ecole polytechnique},
     year = {1982},
     language = {fr},
     url = {http://www.numdam.org/item/JEDP_1982____A2_0/}
}