Hussain H. Al-Kayiem and  Goh Jin Ming,  Experimental Investigation of S-Rotors in Open and Bounded Flows.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2011, vol. 60(12). 2557 - 2562
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/11312.