R. Walentyński, “Refined least squares approach to the initial-value problems unstable in the Lyapunov sense”, Comp. Assist. Methods Eng. Sci., vol. 12, no. 1, pp. 65–81, Dec. 2022, Accessed: Jun. 22, 2025. [Online]. Available: https://cames.ippt.pan.pl/index.php/cames/article/view/1007