КРАСНОДЕМБСЬКИЙ, Адам Михайлович. PERIODICITY OF DECISIONS OF SOME SYSTEM OF TWO NONLINEAR DIFFERENTIAL EQUALIZATIONS OF THE SECOND ORDER. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, [S. l.], n. 1(9), p. 21–25, 2019. Disponível em: https://pvntsh.nung.edu.ua/index.php/number/article/view/281. Acesso em: 6 dec. 2025.