%0 Journal Article %A Hochstenbach, Michiel E. %T Generalizations of harmonic and refined Rayleigh-Ritz %J Electronic transactions on numerical analysis %D 2005 %P 235-252 %V 20 %U http://geodesic.mathdoc.fr/item/ETNA_2005__20__a1/ %G en %F ETNA_2005__20__a1