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Djebali, Smail; Zahar, Samira: Upper and lower solutions for BVPs on the half-line with variable coefficient and derivative depending nonlinearity. Electronic journal of qualitative theory of differential equations 14. pp. 1-18. (2011)
Benchohra, Mouffak; Djebali, Smail; Moussaoui, Toufik: Boundary value problems for doubly perturbed first order ordinary differential systems. Electronic journal of qualitative theory of differential equations 11. pp. 1-10. (2006)