Yuan-Hsiang Chang and  Pin-Chi Lin and  Li-Der Jeng,  Automatic Motion Trajectory Analysis for Dual Human Interaction Using Video Sequences .   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2015, vol. 101(5). 1329 - 1336
    [viewed 09 August 2020]. Available from: https://publications.waset.org/pdf/10001733.