Das, S., S. Sett, S. Saha, S. Saha, S. Roychoudhury, and K. Pal. “A Novel Face Detection Technique Using OpenCV”. International Journal of Research in Engineering, Science and Management, vol. 4, no. 7, July 2021, pp. 121-4, https://journals.resaim.com/ijresm/article/view/990.