WASET
    Razif Mahadi and  John Billingsley,  Precise Measurement of Displacement using Pixels.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2008, vol. 15(3). 686 - 688
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/3578.