SLYUSARCHUK, V. Yu. Necessary and sufficient conditions for oscillation of solutions of nonlinear pulse systems with multiplicatively separated right-hand side. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 3, p. 381–389, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5427. Acesso em: 5 dec. 2025.