@article{ZNSL_1997_243_a13,
     author = {R. S. Saks},
     title = {On properties of the generalized elliptic pseudo-differential operators on closed manifolds},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {215--269},
     year = {1997},
     volume = {243},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_243_a13/}
}