Cîrulis, T., and O. Lietuvietis. “Degenerate Matrix Method for Solving Nonlinear Systems of Differential Equations”. Mathematical Modelling and Analysis 3, no. 1 (December 15, 1998): 45-56. Accessed November 25, 2024. https://jau.vgtu.lt/index.php/MMA/article/view/9986.