@article{GDZPPN001174533,
title = {Improved Difference Schemes for the Dirichlet Problem of Poisson's Equation in the Neighbourhood of Corners.},
journal = {Numerische Mathematik},
volume = {30},
year = {1978},
pages = {315-332},
zbl = {0425.65054},
url = {http://dml.mathdoc.fr/item/GDZPPN001174533}
}
Zenger, C.; Gietl, H. Improved Difference Schemes for the Dirichlet Problem of Poisson's Equation in the Neighbourhood of Corners.. Numerische Mathematik, Tome 30 (1978) pp. 315-332. http://gdmltest.u-ga.fr/item/GDZPPN001174533/