Olfa.Ben Ahmed and  Mahmoud. Mejdoub and  Chokri. Ben Amar,  SIFT Accordion: A Space-Time Descriptor Applied to Human Action Recognition.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2011, vol. 59(11). 1368 - 1374
    [viewed 14 April 2021]. Available from: https://publications.waset.org/pdf/13951.