Bifurcation conditions for solutions of the Lyapunov equation in a Hilbert space. Neliniini Kolyvannya, [S. l.], v. 20, n. 3, p. 373–390, 2017. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/874. Acesso em: 12 apr. 2026.