@article{ETNA_2004__17__a9,
     author = {Armentano, Mar{\'\i}a G. and Dur\'an, Ricardo G.},
     title = {Asymptotic lower bounds for eigenvalues by nonconforming finite element methods},
     journal = {Electronic transactions on numerical analysis},
     pages = {93--101},
     publisher = {mathdoc},
     volume = {17},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2004__17__a9/}
}