Cirulis, T., D. Cirule, and O. Lietuvietis. “Multistep Degenerate Matrix Method for Ordinary Differential Equations”. Mathematical Modelling and Analysis 6, no. 1 (June 30, 2001): 58-67. Accessed November 1, 2024. https://gc.vgtu.lt/index.php/MMA/article/view/9884.