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L. Grinis and  V. Haslavsky and  U. Tzadka,  Self-Excited Vibration in Hydraulic Ball Check Valve.   journal   = {International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 1523 - 1528[viewed 20 September 2018]. Available from: http://waset.org/publications/1394.