Lyapunov functions with alternating signs and the Green - Samoilenko function for linear extensions of dynamical systems. Neliniini Kolyvannya, [S. l.], v. 3, n. 3, p. 383–389, 2000. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/129. Acesso em: 22 jan. 2026.