@incollection{JEDP_1986____A4_0,
     author = {Dauge, Monique and Robert, Didier},
     title = {Formule de {Weyl} pour une classe d{\textquoteright}op\'erateurs pseudodiff\'erentiels d{\textquoteright}ordre n\'egatif sur $L^2({\mathbb {R}}^n)$},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {4},
     pages = {1--10},
     publisher = {Ecole polytechnique},
     year = {1986},
     zbl = {0602.35087},
     language = {fr},
     url = {http://www.numdam.org/item/JEDP_1986____A4_0/}
}