Tawfiq, Luma N. M., and Mariam M. Hilal. 2017. “Solution of 2nd Order Nonlinear Three-Point Boundary Value Problems By Semi-Analytic Technique”. Ibn AL-Haitham Journal For Pure and Applied Sciences 27 (3):501-12. https://jih.uobaghdad.edu.iq/index.php/j/article/view/315.