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Existence of positive periodic solutions of neutral nonlinear differential systems with variable delaysHocine Gabsi، Abdelouaheb Ardjouni، Ahcéne DjoudiOpen Journal of Mathematical Analysisالمجلّد 3، (2)، الصفحات 19-312019مقال وصول مفتوح
Positive periodic solutions of second-order nonlinear neutral differential equations with variable coefficientsHocine Gabsi، Abdelouaheb Ardjouni، Ahcéne DjoudiMathematica Moravicaالمجلّد 22، (2)، الصفحات 69-822018مقال وصول مفتوح 2
