Gaurav Kumar and  Dharmbir Prasad and  Rudra Pratap Singh,  Adaptive Extended Kalman Filter for Ballistic Missile Tracking.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2017, vol. 124(4). 475 - 480
    [viewed 25 September 2020]. Available from: https://publications.waset.org/pdf/10007418.