@article{GDZPPN001169327,
title = {Error-Bounds for Finite Element Method.},
journal = {Numerische Mathematik},
volume = {15},
year = {1970},
pages = {322-333},
zbl = {0214.42001},
url = {http://dml.mathdoc.fr/item/GDZPPN001169327}
}
BABUSKA, I. Error-Bounds for Finite Element Method.. Numerische Mathematik, Tome 15 (1970) pp. 322-333. http://gdmltest.u-ga.fr/item/GDZPPN001169327/