Pointwise error estimate for a noncoercive system of quasi-variational inequalities related to the management of energy production. Boulbrachene, Messaoud — 2002 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
L ∞ -error estimate for a noncoercive system of elliptic quasi-variational inequalities: a simple proof. Boulbrachene, Messaoud — 2005 Applied Mathematics E-Notes [electronic only]
L ∞ -error analysis for a system of quasivariational inequalities with noncoercive operators. Boulbrachene, Messaoud; Saadi, Samira — 2006 Journal of Inequalities and Applications [electronic only]