On two-dimensional Lotka-Volterra system with impulsive effect. Neliniini Kolyvannya, [S. l.], v. 3, n. 4, p. 554–561, 2000. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/148. Acesso em: 22 jan. 2026.