@article{GDZPPN001184040, title = {Some Current Questions on Solving Linear Elliptic Problems.}, journal = {Numerische Mathematik}, volume = {58}, year = {1990}, pages = {527-546}, zbl = {0708.65092}, url = {http://dml.mathdoc.fr/item/GDZPPN001184040} }
Birkhoff, G.; Lynch, Robert E. Some Current Questions on Solving Linear Elliptic Problems.. Numerische Mathematik, Tome 58 (1990) pp. 527-546. http://gdmltest.u-ga.fr/item/GDZPPN001184040/