ГУЛЬКА, Степан Степанович. MIDDLING IN THE NONLINEAR INTEGRAL-DIFFERENTIAL SYSTEMS WITH DOUBLE IMPULSIVE ACTION. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, [S. l.], n. 1(1), p. 16–21, 2019. Disponível em: https://pvntsh.nung.edu.ua/index.php/number/article/view/337. Acesso em: 11 apr. 2025.