D. Elleuch and  T. Damak,  Backstepping Sliding Mode Controller Coupled to Adaptive Sliding Mode Observer for Interconnected Fractional Nonlinear System.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2013, vol. 75(3). 372 - 378
    [viewed 28 May 2022]. Available from: https://publications.waset.org/pdf/2358.