@article{10_1007_s10492_013_0007_5,
     author = {Li, Qin and Lin, Qun and Xie, Hehu},
     title = {Nonconforming finite element approximations of the {Steklov} eigenvalue problem and its lower bound approximations},
     journal = {Applications of Mathematics},
     pages = {129--151},
     publisher = {mathdoc},
     volume = {58},
     number = {2},
     year = {2013},
     doi = {10.1007/s10492-013-0007-5},
     mrnumber = {3034819},
     zbl = {1274.65296},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-013-0007-5/}
}