Felix Che Shu,  Explicit Solutions and Stability of Linear Differential Equations with multiple Delays.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2013, vol. 74(2). 269 - 276
    [viewed 11 May 2024]. Available from: https://publications.waset.org/pdf/16976.