@article{DAN_1993_331_6_a9,
     author = {R. S. Saks},
     title = {Generalized elliptic pseudodifferential operators on a closed},
     journal = {Doklady Akademii Nauk},
     pages = {687--690},
     publisher = {mathdoc},
     volume = {331},
     number = {6},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_331_6_a9/}
}