%0 Journal Article %A Y.-J. Jiang %A J.-P. Zeng %T $L^\infty$-error estimate for a~discrete two-sided obstacle problem and multilevel projective algorithm %J Lobachevskii journal of mathematics %D 2006 %P 43-53 %V 24 %I mathdoc %U http://geodesic.mathdoc.fr/item/LJM_2006_24_a2/ %G en %F LJM_2006_24_a2