@article{GDZPPN001167804,
title = {Error Bounds and Variational Methods for Nonlinear Boundary Value Problems.},
journal = {Numerische Mathematik},
volume = {11},
year = {1968},
pages = {410-415},
zbl = {0176.15004},
url = {http://dml.mathdoc.fr/item/GDZPPN001167804}
}
SHAMPINE, L.F. Error Bounds and Variational Methods for Nonlinear Boundary Value Problems.. Numerische Mathematik, Tome 11 (1968) pp. 410-415. http://gdmltest.u-ga.fr/item/GDZPPN001167804/