De Lellis E. and  Di Vito V. and  Garbarino L. and  Lai C. and  Corraro F.,  Design Process and Real-Time Validation of an Innovative Autonomous Mid-Air Flight and Landing System.   journal   = {International Journal of Aerospace and Mechanical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2011, vol. 55(7). 1234 - 1244
    [viewed 22 October 2019]. Available from: https://publications.waset.org/pdf/11948.