Краснодембський, Адам Михайлович. “PERIODICITY OF DECISIONS OF SOME SYSTEM A FEW NONLINEAR DIFFERENTIAL EQUALIZATIONS OF ODD ORDER”. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, no. 1(33), Feb. 2019, pp. 118-23, https://pvntsh.nung.edu.ua/index.php/number/article/view/108.