N. Popovich and  P. Yan,  Optimal Digital Pitch Aircraft Control.   journal   = {International Journal of Aerospace and Mechanical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2010, vol. 48(12). 1366 - 1371
    [viewed 16 October 2021]. Available from: https://publications.waset.org/pdf/7944.