@article{LJM_2006_24_a2,
     author = {Y.-J. Jiang and J.-P. Zeng},
     title = {$L^\infty$-error estimate for a~discrete two-sided obstacle problem and multilevel projective algorithm},
     journal = {Lobachevskii journal of mathematics},
     pages = {43--53},
     publisher = {mathdoc},
     volume = {24},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_2006_24_a2/}
}