“ Lyapunov-Schmidt Method in Bifurcation Solutions of Nonlinear Fourth Order Differential Equation ”, UTJsci, vol. 3, no. 1, pp. 135–145, Jul. 2011, Accessed: Dec. 26, 2024. [Online]. Available: http://mail.jsci.utq.edu.iq/index.php/main/article/view/218