Maximum norm analysis of an overlapping nonmatching grids method for the obstacle problem. Boulbrachene, M.; Saadi, S. — 2006 Advances in Difference Equations [electronic only]
L ∞ -error estimate for a system of elliptic quasivariational inequalities. Boulbrachene, M.; Haiour, M.; Saadi, S. — 2003 International Journal of Mathematics and Mathematical Sciences