Common fixed point theorems for commutings $k$-uniformly Lipschitzian mappings in metric spaces. Elamrani, M.; Mbarki, A.; Mehdaoui, B. — 2000 Southwest Journal of Pure and Applied Mathematics [electronic only]

Ekeland's principle for vector-valued maps based on the characterization of uniform spaces via families of generalized quasi-metrics. Benbrik, A.; Mbarki, A.; Lahrech, S.; Ouahab, A. — 2006 Lobachevskii Journal of Mathematics