Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{NUMA_1990__57_6-7_133464, author = {G. Birkhoff and Robert E. Lynch}, title = {Some {Current} {Questions} on {Solving} {Linear} {Elliptic} {Problems.}}, journal = {Numerische Mathematik}, pages = {527--546}, publisher = {mathdoc}, volume = {57}, number = {6-7}, year = {1990}, zbl = {0708.65092}, url = {http://geodesic.mathdoc.fr/item/NUMA_1990__57_6-7_133464/} }
G. Birkhoff; Robert E. Lynch. Some Current Questions on Solving Linear Elliptic Problems.. Numerische Mathematik, Tome 57 (1990) no. 6-7, pp. 527-546. http://geodesic.mathdoc.fr/item/NUMA_1990__57_6-7_133464/