%0 Journal Article %A C. Zenger %A H. Gietl %T Improved Difference Schemes for the Dirichlet Problem of Poisson's Equation in the Neighbourhood of Corners. %J Numerische Mathematik %D 1978 %P 315-332 %V 30 %I mathdoc %U http://geodesic.mathdoc.fr/item/NUMA_1978__30_132553/ %F NUMA_1978__30_132553