WASET
    Peerapong Uthansakul and  Monthippa Uthansakul,  Online Signature Verification Using Angular Transformation for e-Commerce Services.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2010, vol. 37(1). 96 - 101
    [viewed 04 May 2024]. Available from: https://publications.waset.org/pdf/2291.