@article{GDZPPN001185675,
title = {Optimal error estimation for Petrov-Galerkin methods in two dimensions.},
journal = {Numerische Mathematik},
volume = {63},
year = {1992},
pages = {359-372},
zbl = {0783.65077},
url = {http://dml.mathdoc.fr/item/GDZPPN001185675}
}
Süli, E.; Morton, K.W.; Murdoch, T. Optimal error estimation for Petrov-Galerkin methods in two dimensions.. Numerische Mathematik, Tome 63 (1992) pp. 359-372. http://gdmltest.u-ga.fr/item/GDZPPN001185675/