%0 Journal Article %A Ivan Georgiev %A Svetozar Margenov %T Element Preconditioning Technique for Rotated Bilinear FEM Elliptic Systems %J Mathematica balkanica %D 2006 %P 39 %V 20 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MABA_2006_20_1_a2/ %F MABA_2006_20_1_a2