Seyyed Yasser Hashemi,  Ultra High Speed Approach for Document Skew Detection and Correction Based On Centre of Gravity.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2013, vol. 83(11). 1519 - 1524
    [viewed 12 May 2021]. Available from: https://publications.waset.org/pdf/9997229.