M. HASSAN, Jafar; A. TAHA, Abdul Whab; A. OLEIWI, Majid. Linear Analysis to Control an Electro-hydraulic System Using Proportional Directional Control Valve. Journal of Engineering and Sustainable Development, Baghdad, Iraq, v. 13, n. 2, p. 128–143, 2009. Disponível em: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1548.. Acesso em: 3 may. 2025.