6Xia Zhixin. A Review on the theory and test of pump contaminant wear[M]. The BFPR Journal VoL, 17 No. 2 Oklahoma state university, 1983
7Xia Zhixin, Wu Zongzhi, Zhu Hongmei. The effect of contaminant abrasivity on the wear of hydraulic pumps[M]. Proceedings of the 2nd international conference on FPTC Zhejiang university, 1989