@article{MZM_2013_93_2_a12,
     author = {He-Jun Sun},
     title = {Inequalities for {Lower-Order} {Eigenvalues} of a {Fourth-Order} {Elliptic} {Operator}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {286--294},
     publisher = {mathdoc},
     volume = {93},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2013_93_2_a12/}
}