@article{GDZPPN001176536,
title = {Convergence of a Penalty-Finite Element Approximation for an Obstacle Problem.},
journal = {Numerische Mathematik},
volume = {37},
year = {1981},
pages = {105-120},
zbl = {0469.65044},
url = {http://dml.mathdoc.fr/item/GDZPPN001176536}
}
Kikuchi, N. Convergence of a Penalty-Finite Element Approximation for an Obstacle Problem.. Numerische Mathematik, Tome 37 (1981) pp. 105-120. http://gdmltest.u-ga.fr/item/GDZPPN001176536/