Jamaludin, S., N. Zainal, and W. M. D. W Zaki. “Comparison of Iris Recognition Between Active Contour and Hough Transform”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 8, no. 4, July 2016, pp. 53-58, https://jtec.utem.edu.my/jtec/article/view/1171.