WASET
    Assem M. F. Sallam and  Ah. El-S. Makled,  Two-Stage Launch Vehicle Trajectory Modeling for Low Earth Orbit Applications.   journal   = {International Journal of Aerospace and Mechanical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2017, vol. 121(1). 86 - 93
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/10006059.