%0 Journal Article %A Wilhelm Heinrichs %T Spectral Methods with Sparse Matrices. %J Numerische Mathematik %D 1989 %P 25-42 %V 56 %N 2-3 %I mathdoc %U http://geodesic.mathdoc.fr/item/NUMA_1989__56_2-3_133382/ %F NUMA_1989__56_2-3_133382