Walentyński, Ryszard. “Refined Least Squares Approach to the Initial-Value Problems Unstable in the Lyapunov Sense”. Computer Assisted Methods in Engineering and Science 12, no. 1 (December 8, 2022): 65–81. Accessed January 18, 2026. https://cames.ippt.gov.pl/index.php/cames/article/view/1007.