Omid A. Zargar,  Hydraulic Unbalance in Oil Injected Twin Rotary Screw Compressor Vibration Analysis  (A Case History Related to Iran Oil Industries).   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2013, vol. 83(11). 2371 - 2377
    [viewed 20 October 2019]. Available from: https://publications.waset.org/pdf/9997612.