Neghmish, Adyar Kamel, and Hussain Ali Mohamad. “Oscillation and Convergence of Solutions of Second Order Neutral Differential Equations With Periodic Coefficients”. Iraqi Journal of Science 66, no. 2 (February 28, 2025): 712–720. Accessed January 8, 2026. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/11812.