Belovs, M., and T. Cirulis. “Degenerate Matrices Methods by Splines for Boundary Values Problems of Ordinary Differential Equations”. Mathematical Modelling and Analysis 10, no. 2 (June 30, 2005): 127-140. Accessed April 29, 2024. https://journals.vilniustech.lt/index.php/MMA/article/view/9669.