Wang, Z-Q, L-Y Gu, J-W Cheng, Y-Y Wang, M Gao, and X-J Jia. 2014. “Research on the Piston With Damping Hole and Pressure Recess of Axial Piston Motor”. Periodica Polytechnica Mechanical Engineering 58 (1):27-35. https://doi.org/10.3311/PPme.7381.