%0 Journal Article %A He-Jun Sun %T Inequalities for Lower-Order Eigenvalues of a Fourth-Order Elliptic Operator %J Matematičeskie zametki %D 2013 %P 286-294 %V 93 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_2013_93_2_a12/ %G ru %F MZM_2013_93_2_a12