NASYKHOVA, L. V.; TEREKHIN, M. T. The existence of a bifurcation value of a parameter of a system of differential equations with deviating argument. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 6, p. 799–805, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5064. Acesso em: 5 dec. 2025.