Neagu , Natalia, and Mihail Popa. “Lyapunov’s Stability of the Unperturbed Motion Governed Bythe ”. Acta et Commentationes Exact and Natural Sciences 12, no. 2 (February 2, 2022): 74-81. Accessed October 16, 2024. https://revistaust.upsc.md/index.php/acta_exacte/article/view/714.