Abdulrahman S. Alturki and  John S. Loomis,  X-Corner Detection for Camera Calibration Using Saddle Points.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2016, vol. 112(4). 676 - 681
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10003988.