Atef M. Ghaleb and  Mohamed Z. Ramadan and  Khalid Saad Aljaloud,  Effect of Ambient Oxygen Content and Lifting Frequency on the Participant’s Lifting Capabilities, Muscle Activities, and Perceived Exertion  .   journal   = {International Journal of Health and Medical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2019, vol. 156(12). 489 - 493
    [viewed 18 October 2021]. Available from: