Naji, S., R. Zainuddin, S. A. Kareem, and H. A. Jalab. “Detecting Faces in Colored Images Using Multi-Skin Color Models and Neural Network With Texture Analysis”. Malaysian Journal of Computer Science, vol. 26, no. 2, June 2013, pp. 101-23, https://jpmm.um.edu.my/index.php/MJCS/article/view/6737.