1. B. Local, Report by google, https://www.brightlocal.com/research/google-my-business-spam/, 2019 (accessed November 27, 2019).
2. C.-T. Wu, K.-T. Cheng, Q. Zhu, Y.-L. Wu, Using visual features for anti-spam filtering, in: IEEE International Conference on Image Processing 2005, vol. 3, IEEE, 2005, pp. III–509.
3. Spam filtering based on the analysis of text information embedded into images;Fumera;J. Mach. Learn. Res.,2006
4. Filtering image spam with near-duplicate detection;Wang,2007
5. Detecting image spam using visual features and near duplicate detection;Mehta,2008