H. Ait Abderrahmane and  M. Fayed and  H. D. Ng and  G. H. Vatistas,  Synchronization of Traveling Waves within a Hollow-Core Vortex.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2017, vol. 124(4). 742 - 746
    [viewed 19 March 2024]. Available from: https://publications.waset.org/pdf/10006754.