M. A. Sohaly and  M. A. Elfouly,  Stability Analysis of Two-delay Differential Equation for Parkinson's Disease Models with Positive Feedback.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2021, vol. 169(1). 8 - 13
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10011816.