Nandini N. and  Srikanta Murthy K. and  G. Hemantha Kumar,  Estimation of Skew Angle in Binary Document Images Using Hough Transform.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2008, vol. 18(6). 1812 - 1817
    [viewed 06 December 2019]. Available from: https://publications.waset.org/pdf/8967.