SLYUSARCHUK, V. Yu. Investigation of systems of differential equations with delays and constraints imposed on the delays and derivatives of the solutions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 5, p. 677–691, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1466. Acesso em: 5 dec. 2025.