F. Badr, Munaf. “Employing Analogue and Digital Solenoid Hydraulic Valves in Position Control System”. Journal of Engineering and Sustainable Development 16, no. 3 (September 1, 2012): 269–286. Accessed February 11, 2025. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1283.