Краснодембський, Адам Михайлович. “PERIODICITY OF DECISIONS OF SOME SYSTEM A FEW NONLINEAR DIFFERENTIAL EQUALIZATIONS OF AN EVEN ORDER”. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, no. 1(21) (March 5, 2019): 45–50. Accessed March 15, 2025. https://pvntsh.nung.edu.ua/index.php/number/article/view/180.