@article{ZNSL_1986_152_a9,
     author = {Yu. G. Safarov},
     title = {Asymptotics of the spectrum of pseudo-differential operator with periodic bicharacteristics},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {94--104},
     publisher = {mathdoc},
     volume = {152},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1986_152_a9/}
}