Nugroho, H. A., F. Rahadian, T. B. Adji, and R. L. B. Buana. “Texture Analysis for Skin Classification in Pornography Content Filtering Based on Support Vector Machine”. Journal of Engineering and Technological Sciences, vol. 48, no. 5, Nov. 2016, pp. 584-96, doi:10.5614/j.eng.technol.sci.2016.48.5.6.