Liliia N. Butymova and  Vladimir Ya Modorskii,  Rotary Machine Sealing Oscillation Frequencies and Phase Shift Analysis.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2016, vol. 112(4). 652 - 665
    [viewed 09 May 2024]. Available from: https://publications.waset.org/pdf/10004062.