1. A general principle on ordered sets in nonlinear functional analysis;Brézis;Advances in Math.,1976
2. Asymmetric locally convex spaces;Cobzaş;Int. J. Math. Math. Sci.,2005
3. Completeness in quasi-metric spaces and Ekeland variational principle;Cobzaş;Topology Appl.,2011
4. Remarques sur les problèmes variationnels, I;Ekeland;C. R. Acad. Sci. Paris Sér. A–B,1972