Neagu, N., D. Cozma, і M. Popa. INVARIANT METHODS FOR STUDYING STABILITY OF UNPERTURBED MOTION IN TERNARY DIFFERENTIAL SYSTEMS WITH POLYNOMIAL NONLINEARITIES. Буковинський математичний журнал 4, no. 3-4 (Лютий 19, 2017). Accessed Травень 4, 2024. https://bmj.fmi.org.ua/index.php/adm/article/view/219.