M. De la Sen,  Some Remarks About Riemann-Liouville and Caputo Impulsive Fractional Calculus.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2011, vol. 57(9). 1455 - 1460
    [viewed 29 October 2020]. Available from: https://publications.waset.org/pdf/9157.