%0 Journal Article %A Zbigniew Leyk %T Galerkin Method and Optimal Error Algorithms in Hilbert Spaces. %J Numerische Mathematik %D 1990 %P 1-14 %V 57 %N 6-7 %I mathdoc %U http://geodesic.mathdoc.fr/item/NUMA_1990__57_6-7_133431/ %F NUMA_1990__57_6-7_133431