E. J. Talabani, R., A. Faraj, Y. and A. H. AL-Baldawi, R. (2009) “A Study on the Effects of Servovalve Lap on the Performance of a Closed - Loop Electrohydraulic Position Control System”, Al-Rafidain Engineering Journal (AREJ), 17(5), pp. 1–14. doi: 10.33899/rengj.2009.43375.