Construction of Lyapunov functions in the form of pencils of quadratic forms. Neliniini Kolyvannya, [S. l.], v. 21, n. 2, p. 147–154, 2018. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/901. Acesso em: 6 dec. 2025.