Adnene Arbi and  Chaouki Aouiti and  Abderrahmane Touati,  Globally Exponential Stability for Hopfield Neural Networks with Delays and Impulsive Perturbations.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2012, vol. 63(3). 311 - 316
    [viewed 21 September 2019]. Available from: https://publications.waset.org/pdf/5155.