@article{ refId, author = {{Rahman, Talal} and {Xu, Xuejun}}, encoding = {tex}, title = {A multilevel preconditioner for the mortar method for nonconforming \$P\_1\$ finite element}, DOI= "10.1051/m2an/2009003", url= "http://dx.doi.org/10.1051/m2an/2009003", journal = {ESAIM: M2AN}, year = 2009, volume = 43, number = 3, pages = "429-444", month = "", }