%0 Journal Article %A Canuto, C. %T Eigenvalue approximations by mixed methods %J ESAIM: Mathematical Modelling and Numerical Analysis %D 1978 %P 27-50 %V 12 %N 1 %I Centrale des revues, Dunod-Gauthier-Villars %C Montreuil %U http://geodesic.mathdoc.fr/item/M2AN_1978__12_1_27_0/ %G en %F M2AN_1978__12_1_27_0