Краснодембський АМ. PERIODICITY OF DECISIONS OF SYSTEM OF TWO NONLINEAR DIFFERENTIAL EQUALIZATIONS OF THE THIRD ORDER. Number [Internet]. 2019 Mar. 7 [cited 2026 Feb. 15];(1(13):39-42. Available from: https://www.pvntsh.nung.edu.ua/index.php/number/article/view/260