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 January 6, 2025. https://mla.vgtu.lt/index.php/MMA/article/view/9986.