Bourafa, S., M. S. Abdelouahab, and R. Lozi. “On Periodic Solutions of Fractional-Order Differential Systems With a Fixed Length of Sliding Memory”. Journal of Innovative Applied Mathematics and Computational Sciences, vol. 1, no. 1, Dec. 2021, pp. 64-78, doi:10.58205/jiamcs.v1i1.6.