@article{GDZPPN001183710,
title = {Galerkin Method and Optimal Error Algorithms in Hilbert Spaces.},
journal = {Numerische Mathematik},
volume = {58},
year = {1990},
pages = {1-14},
zbl = {0672.65030},
url = {http://dml.mathdoc.fr/item/GDZPPN001183710}
}
Leyk, Zbigniew. Galerkin Method and Optimal Error Algorithms in Hilbert Spaces.. Numerische Mathematik, Tome 58 (1990) pp. 1-14. http://gdmltest.u-ga.fr/item/GDZPPN001183710/