On combined asymptotic expansions in singular perturbations. Benoît, Eric, El Hamidi, Abdallah, Fruchard, Augustin (2002) Electronic Journal of Differential Equations (EJDE) [electronic only]
On Pontryagin-Rodygin's theorem for convergence of solutions of slow and fast systems. Sari, Tewfik, Yadi, Karim (2004) Electronic Journal of Differential Equations (EJDE) [electronic only]
On the averaging method for differential equations with delay. Lakrib, Mustapha (2002) Electronic Journal of Differential Equations (EJDE) [electronic only]