@article{FAA_1984_18_3_a15,
     author = {S. Z. Levendorskii},
     title = {Asymptotic behavior of the spectrum of problems of the form $Au=tBu$ for operators that are elliptic in the {Douglis--Nirenberg} sense},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {84--85},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1984_18_3_a15/}
}