Gabriel Sitler and  Yousef Sardahi and  Asad Salem,  Optimal Sliding Mode Controller for Knee Flexion During Walking.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2024, vol. 205(1). 9 - 15
    [viewed 28 April 2024]. Available from: https://publications.waset.org/pdf/10013451.