%0 Journal Article %A A. M. Lopatnikov %T Some estimates of the least eigenvalue for an elliptic operator in a multiply connected domain %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 1986 %P 95-97 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_1986_2_a21/ %G ru %F VMUMM_1986_2_a21