WASET
    Barenten Suciu,  Frictional Effects on the Dynamics of a Truncated Double-Cone Gravitational Motor.   journal   = {International Journal of Aerospace and Mechanical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2017, vol. 121(1). 28 - 38
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/10005990.