@incollection{AST_1992__207__35_0,
     author = {Shubin, M. A.},
     title = {Spectral theory of elliptic operators on non-compact manifolds},
     booktitle = {M\'ethodes semi-classiques Volume 1 - \'Ecole d'\'Et\'e (Nantes, juin 1991)},
     series = {Ast\'erisque},
     pages = {35--108},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {207},
     year = {1992},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1992__207__35_0/}
}