Cheng, M., P.-Y. Chen, S. Liu, S. Chang, C.-J. Hsieh, and P. Das. “Self-Progressing Robust Training”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 35, no. 8, May 2021, pp. 7107-15, https://ojs.aaai.org/index.php/AAAI/article/view/16874.