Verma, Amit, and Nazia Urus. “Well Ordered Monotone Iterative Technique for Nonlinear Second Order Four Point Dirichlet BVPs”. Mathematical Modelling and Analysis 27, no. 1 (February 7, 2022): 59–77. Accessed November 25, 2024. https://jcem.vgtu.lt/index.php/MMA/article/view/14198.