%0 Journal Article %A G. Birkhoff %A Robert E. Lynch %T Some Current Questions on Solving Linear Elliptic Problems. %J Numerische Mathematik %D 1990 %P 527-546 %V 57 %N 6-7 %I mathdoc %U http://geodesic.mathdoc.fr/item/NUMA_1990__57_6-7_133464/ %F NUMA_1990__57_6-7_133464