Jaroslav Polec and  Petra Heribanová and  Tomáš Hirner,  Key Frames Extraction for Sign Language Video Analysis and Recognition.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2013, vol. 78(6). 611 - 615
    [viewed 23 September 2020]. Available from: https://publications.waset.org/pdf/2672.