Fuad H. Veliev,  Negative Pressure Waves in Hydraulic Systems.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2015, vol. 97(1). 107 - 110
    [viewed 21 October 2019]. Available from: https://publications.waset.org/pdf/10000452.