@book{AST_1984__112__R1_0,
     author = {Helffer, Bernard},
     title = {Th\'eorie spectrale pour des op\'erateurs globalement elliptiques},
     series = {Ast\'erisque},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {112},
     year = {1984},
     mrnumber = {743094},
     zbl = {0541.35002},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1984__112__R1_0/}
}