ГУРГУЛА, Степан Іванович; ПЕРКАТЮК, Ігор Йосипович. ABOUT THE SECOND LIAPOUNOV’S METHOD IN SYSTEMS WITH IMPULSIVE ACTION. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, [S. l.], n. 1(1), p. 9–15, 2019. Disponível em: https://pvntsh.nung.edu.ua/index.php/number/article/view/336. Acesso em: 6 dec. 2025.