%0 Journal Article %A Elias A. Lipitakis %A George A. Gravvanis %T The numerical solution of large finite element systems by explicit preconditioning semi-direct methods %J Μαθηματική Επιθεώρηση %D 1987 %P 63-82 %V 32 %I mathdoc %U http://geodesic.mathdoc.fr/item/MR_1987__32_a10/ %G gr %F MR_1987__32_a10