%0 Journal Article %A A. V. Efremov %A D. V. Efremov %T Asymptotic behavior of the spectrum of an elliptic operator invariant relative to a discrete group of diffeomorphisms %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 1986 %P 57-59 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_1986_1_a15/ %G ru %F VMUMM_1986_1_a15