TY - JOUR AU - Ivan Georgiev AU - Svetozar Margenov TI - Element Preconditioning Technique for Rotated Bilinear FEM Elliptic Systems JO - Mathematica balkanica PY - 2006 SP - 39 VL - 20 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MABA_2006_20_1_a2/ ID - MABA_2006_20_1_a2 ER -