%0 Journal Article %A Andreev, Andrey %A Racheva, Milena %T Two-sided bounds of eigenvalues of second- and fourth-order elliptic operators %J Applications of Mathematics %D 2014 %P 371-390 %V 59 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1007/s10492-014-0062-6/ %R 10.1007/s10492-014-0062-6 %G en %F 10_1007_s10492_014_0062_6