Zheng, Huicheng, and Mohamed Daoudi. “Blocking Adult Images Based on Statistical Skin Detection”. ELCVIA Electronic Letters on Computer Vision and Image Analysis 4, no. 2 (November 3, 2004): 1–14. Accessed June 5, 2025. https://elcvia.cvc.uab.cat/article/view/v4-n2-zheng-daoudi.