Neagu, Natalia, Mihail Popa, and Victor Orlov. “Stability of Unperturbed Motion Governed by the Ternary Differential System of Lyapunov-Darboux Type With Nonlinearities of Degree Four”. Acta et Commentationes Exact and Natural Sciences 14, no. 2 (September 23, 2023): 57-67. Accessed October 16, 2024. https://revistaust.upsc.md/index.php/acta_exacte/article/view/889.