@article{DAN_1986_288_3_a5,
     author = {S. Z. Levendorskii},
     title = {Asymptotic behavior of the spectrum of pseudodifferential operators of negative order with multiple characteristics},
     journal = {Doklady Akademii Nauk},
     pages = {540--543},
     publisher = {mathdoc},
     volume = {288},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_288_3_a5/}
}