M. Hassan, Jafar, Abdul Whab A. Taha, and Majid A. Oleiwi. “Linear Analysis to Control an Electro-Hydraulic System Using Proportional Directional Control Valve”. Journal of Engineering and Sustainable Development 13, no. 2 (June 1, 2009): 128–143. Accessed May 3, 2025. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1548.