Sachin Bhalekar,  A Necessary Condition for the Existence of Chaos in Fractional Order Delay Differential Equations.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2013, vol. 75(3). 525 - 529
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/16807.