Konstanca Nikolajevic and  Nicolas Belanger and  David Duvivier and  Rabie Ben Atitallah and  Abdelhakim Artiba,  A Method to Compute Efficient 3D Helicopters Flight Trajectories Based on a Motion Polymorph-Primitives Algorithm.   journal   = {International Journal of Mechanical and Materials Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2015, vol. 104(8). 2019 - 2027
    [viewed 16 October 2021]. Available from: https://publications.waset.org/pdf/10003043.