On asymptotic stability and instability of a functional-differential equation with periodic right-hand side. Neliniini Kolyvannya, [S. l.], v. 4, n. 3, p. 290–297, 2001. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/173. Acesso em: 22 jan. 2026.