1. A. A. Kazimov, Experimental Study of Mud Pump Valve Wear: Auth. Abstr. Diss. Cand. Tech. Sci., Azizbekov AZINNeftekhim, Baku (1972).
2. S. G. Babaev, “Study of hydroabrasive erosion under clay solution movement conditions in a valve slot,” Mash. Neft. Oborud., No. 5, 78–80 (1968).