@article{ZNSL_1999_259_a10,
     author = {R. S. Saks},
     title = {Local structure of generalized elliptic pseudodifferential operators and method of {Gauss}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {212--237},
     publisher = {mathdoc},
     volume = {259},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1999_259_a10/}
}