Periodic perturbations of non-conservative second order differential equations. Chouikha, A.Raouf — 2002 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Existence of metrics with harmonic curvature and non parallel Ricci tensor. Chouikha, A.Raouf — 2003 Balkan Journal of Geometry and its Applications (BJGA)
Solutions series for some non-harmonic motion equations. Chouikha, A.Raouf — 2003 Electronic Journal of Differential Equations (EJDE) [electronic only]
Existence of periodic solution for perturbed generalized Liénard equations. Boussaada, Islam; Chouikha, A.Raouf — 2006 Electronic Journal of Differential Equations (EJDE) [electronic only]