Bounded Solutions of the Second Order Differential Equation x ?+f(x) x ?+g(x)=u(t). Baghdad Science Journal, Iraq, Baghdad, v. 12, n. 4, p. 822–825, 2015. DOI: 10.21123/bsj.2015.12.4.822-825. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/2130.. Acesso em: 28 dec. 2024.