3N. Li,Y. M. Gao,X. W. Wei,W. N. Dong,Study of relieving impact on hydraulic press [ J ], Digital Technique & Machi- ning Technological Equipment ,2009(4) ,pp. 15 - 16.
4Y. X. Lu. The Hydraulic &Pneumatic Engineering Hand- book[ M ]. Chinese Machine Press, Beijing ,2005.
5Y.L. FU, X. Y. QI. System modeling and simulation based on AMESim[ M ]. Beijing University of Aeronautics & Astronautics Press, Beijing,2006.