@article{GDZPPN001173960,
title = {Error Estimates for the Finite Element Solution of Variational Inequalities. Part I. Primal Theory.},
journal = {Numerische Mathematik},
volume = {28},
year = {1977},
pages = {431-444},
zbl = {0369.65030},
url = {http://dml.mathdoc.fr/item/GDZPPN001173960}
}
Brezzi, F.; Hager, W.W.; Raviart, P.A. Error Estimates for the Finite Element Solution of Variational Inequalities. Part I. Primal Theory.. Numerische Mathematik, Tome 28 (1977) pp. 431-444. http://gdmltest.u-ga.fr/item/GDZPPN001173960/