Yun-Tao Zhang and  Jong-Yeop Bae and  Whoi-Yul Kim,  Multi-Layer Multi-Feature Background Subtraction Using Codebook Model Framework.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2016, vol. 109(1). 23 - 27
    [viewed 17 October 2019]. Available from: https://publications.waset.org/pdf/10003227.