@article{ZNSL_1984_138_a0,
     author = {A. S. Andreev},
     title = {Spectral asymptotic for the compact pseudo-differential operators with a~{\textquotedblleft}constant{\textquotedblright} symbol},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {3--7},
     year = {1984},
     volume = {138},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_138_a0/}
}