Bounded Solutions of the Second Order Differential Equation x ?+f(x) x ?+g(x)=u(t). Baghdad Sci.J [Internet]. 2015 Dec. 6 [cited 2024 Apr. 28];12(4):822-5. Available from: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/2130